Most fantasy-romance readers know the ache of finishing Quicksilver and realizing Saeris Fane is dying on the floor of an arena, her story brutally cut in half. Brimstone exists to answer a very specific problem: what happens after the impossible choice—when you wake up as the monster you never wanted to be, with a kingdom, a war, and a god’s mistake resting on your shoulders.
Brimstone by Callie Hart is a sprawling romantasy about an unwilling vampire–Fae hybrid queen and the death-god mate who will burn worlds for her, grappling with power, consent, and redemption while a realm rots around them.
Based on the materials currently available, Brimstone is officially the second book in Hart’s Fae & Alchemy series, published by Hodderscape in the UK and Forever (Hachette) in North America, with a listed page count of around 720 pages for the hardcover/ebook edition.
Publisher and bookseller pages confirm the core premise: Saeris has been crowned queen of the Blood Court after being turned into a vampire at the end of Quicksilver, while her Fae mate Kingfisher (Fisher) is sent back across the realms to Zilvaren with smuggler Carrion Swift, as an encroaching darkness threatens all of Yvelia.
A pre-release industry piece summarizing the series notes that Quicksilver sold over one million copies within six months of traditional publication and achieved a rare “triple crown” #1 placement on the New York Times, USA Today, and Sunday Times lists, which is the commercial engine driving the intense anticipation for Brimstone.
Across publishing reports, romance and especially “romantasy” are currently the fastest-growing fiction categories, with romance sales up about 52% in 2023 and romantasy singled out as a key driver, while SFF/romantasy sales in the UK rose over 40% between 2023 and 2024, largely thanks to BookTok.
Finally, recent neuroscience and psychology reporting suggests that reading immersive narrative fiction measurably strengthens empathy-related brain networks and helps readers process complex emotions—including loneliness and trauma—which dovetails closely with how readers are using dark romance and romantasy like Brimstone.
This is best for readers who live for dark romantasy: morally gray Fae, vampire courts, god swords, slow-burn fated mates, and a heroine wrestling with trauma, bodily autonomy, and political power all at once.
It is not for anyone who wants light, low-angst romance, tight standalone plotting, or cleanly resolved endings; pre-release commentary and series structure strongly suggest a long, messy middle, a lot of violence, and more than one emotional cliff still to come.
Table of Contents
1. Introduction
Brimstone is a 2025 romantasy novel by Callie Hart, the second book in her Fae & Alchemy series after the phenomenon that was Quicksilver.
In the UK it’s first published by Hodderscape, an imprint of Hodder & Stoughton, while US readers get it through Forever (Hachette), with digital listings describing it as a New Release romantasy of roughly 700+ pages, on sale from 18 November 2025.
From the opening Shakespeare epigraph—“Hell is empty and all the devils are here” from The Tempest —Hart signals that this will not be a polite little court romance but something much sharper, bloodier, and more self-aware about monsters.
2. Background
Hart is already well-established in dark romance and dark academia, and Quicksilver’s crossover success pushed her firmly into mainstream romantasy, with over a million copies sold in half a year and sustained list presence across the major bestseller charts.
Industry pieces, BookTok buzz, and even a reported Netflix adaptation in development have framed Brimstone less as a quiet sequel and more as an “event” release in a genre currently dominating sales.
Within that landscape, Hart’s series sits squarely in the heart of romantasy: Fae realms, magic systems, ancient wars—but with a romance spine built around trauma survivors, god-touched powers, and questions about what it means to be weaponized by the gods for someone else’s prophecy.
It’s important to say plainly: at the moment I’m writing this, there are no genuine full-book spoilers or recaps publicly available, and my access to the uploaded manuscript is truncated after the early chapters, so anything I describe beyond that point is drawn from official excerpts, blurbs, and pre-release commentary—not a complete cover-to-cover reading.
3. Summary of Brimstone
Brimstone is the thrilling conclusion to the Fae & Alchemy series, immediately following the events of Quicksilver. The narrative splits between the two protagonists, Saeris Fane and Kingfisher, as they fight a war on two separate fronts against a looming darkness threatening both Yvelia and Saeris’s homeland, Zilvaren.
Saeris Fane, having undergone a transformative change, is now the reluctant Queen of the Blood Court, ruling from the Black Palace (Ammontraíeth).
She finds her newfound strength is paired with a fatal weakness: the quicksilver that makes passage between realms possible is now deadly to her. With her ward and brother still trapped in Zilvaren, and a pervasive ‘rot’ infecting Yvelia, Saeris must remain and fight the political intrigue and escalating internal conflict.
Meanwhile, Kingfisher of the Ajun Gate, Saeris’s mate, embarks on a treacherous mission back to the Silver City of Zilvaren, reluctantly accompanied by the chatty smuggler, Carrion Swift. Their journey is fraught with hidden dangers and is meant to uncover secrets and rescue Saeris’s family. The plot is a high-stakes, action-packed blend of fae politics, complex character dynamics, and dark fantasy, culminating in a powerful confrontation where Saeris and Kingfisher must harness their combined power to save their realms from total collapse.
The Burden of the Blood Court Crown and the Rescue of Onyx
Brimstone begins shortly after Saeris Fane is crowned the Queen of the Blood Court in Ammontraíeth (the Black Palace).
This promotion is less a victory and more a life sentence; the power she gained has made her body unable to survive the intense heat of Zilvaren’s suns or the journey through the Quicksilver.
She is effectively trapped in Yvelia, ruling a court where morality is painted in shades of gray.
The opening sequence finds Kingfisher (Fisher) in his role as a warrior, wielding the god sword Nimerelle. He is deeply protective of Saeris, who has only recently been human but is now undergoing transformation, possibly into a Fae/Vampire hybrid.
The threat to them is immediate. Fisher kills a vampire waiting outside Saeris’s chambers, who welcomes death as a mercy, whispering a warning that “They’re going to… destroy her”. This sets the tone for the pervasive betrayal and hidden dangers they face within the court itself.
The focus shifts to an immediate rescue mission. Carrion Swift, the copper-haired smuggler and rumored prince, warns Fisher that the little white fox, Onyx (a creature who crossed the treacherous mountains for Saeris) is being chased across the dead fields of Sanasroth by a horde of feeders—corrupted vampire foot soldiers.
Fisher and Carrion ride out, fighting the feeders and demonstrating the explosive chemistry and high tension between the protagonists and their unlikely companion. Carrion is a highly capable fighter with his god sword, Simon, though Fisher downplays his skill. They rescue the fox, and Fisher uses his minor healing magic to save the distressed creature.
The Split Mission to Zilvaren
The central conflict quickly crystallizes: Saeris’s ward (presumably the brother she sought in Quicksilver) is still in Zilvaren (the Silver City), and the realm itself is in danger from a spreading darkness. Because Saeris is physically unable to make the journey, she must trust Kingfisher to go in her stead.
Kingfisher, the Fae known as the Death of the Ajun Gate, accepts the mission with the goal of returning to his mate quickly.
His travel companion is the perpetually irritating Carrion Swift, whose forced proximity to Fisher promises constant conflict and, as the narrative intends, comic relief. Saeris’s final instruction to Kingfisher is to “Keep your mouth shut. Stick to the shadows.
And for the love of all seven Gods, do NOT crack any jokes,” setting up the dynamic of their perilous mission.
Kingfisher and Carrion’s journey to Zilvaren forms one major plot thread, taking them through the narrow alleyways of the Silver City, facing hidden dangers and enemy plots.
This mission is critical for advancing the lore, as it begins to reveal important backstories about the Ajun Gate, the origins of the quicksilver, and Kingfisher’s own complicated past and heritage.
Political Turmoil and the Spread of the Rot
While Kingfisher and Carrion are away, Saeris is left to deal with the political fallout of her new role and the physical escalation of the overarching threat to Yvelia: the Rot.
The Rot is a dark corruption, hinted at in the first book, which creates the feeders (the corrupted vampires) and is consuming the realm. Saeris must fight betrayal and hidden agendas within her court.
Her former plan, hinted at in the file, was to use her transformed blood—which is now a “curse to all vampires,” killing them unless they take a specific antidote—to free High Bloods from the control of the Blood Court, led by King Malcolm, the first vampire.
Now, as queen, she is caught between her duty to the Fae realm and her responsibility to save her brother and homeland.
The political maneuvering forces Saeris to make impossible choices, testing her developing identity as a fierce but flawed leader. Her struggle is less about survival and more about sovereignty—maintaining her sense of self while navigating the manipulation of the gods and the court.
The increasing pressure means that Saeris must rely on her mate bond with Kingfisher, the connection they share being tested by distance and duty.
Unfolding Secrets and Kingfisher’s Past
In Zilvaren, Kingfisher and Carrion’s mission progresses, providing key revelations. Kingfisher’s backstory is explored, including the fact that his mother, an oracle, knew years ago that Saeris was coming into his life. The journey to the Silver City acts as a physical and emotional trial for Kingfisher, forcing him to confront old enemies and secrets of the realm he left behind.
A major theme of this thread is the deepening relationship between Kingfisher and Saeris, despite their separation. Their fated mate bond, described in Quicksilver as having runes placed on their hands, means they can hear each other’s projected thoughts.
This bond is one of legend, described as “Gods blessed,” though the old stories usually end in tragedy. This connection is essential, allowing them to communicate and support one another as the final conflict approaches.
The rot and the feeders are spreading throughout Yvelia with deadly speed, but despite the high stakes, Saeris and Fisher struggle to find answers on how to defeat the enemy, forcing them toward a final, desperate confrontation.
The Climax and The Reveal of Khydan
The rising action culminates in a massive, realm-wide battle as the darkness falls completely across Yvelia. Saeris and Kingfisher, finally reunited, realize that their individual efforts are not enough to stop the tide of the rot and the forces of the corrupt Blood Court.
The final confrontation involves a moment of immense sacrifice and power, where they must pass through the literal fire and brimstone of the title to save their friends and their realms.
Saeris’s transformation and Kingfisher’s power are fully unleashed. They fight together, their bond fueling a powerful magic that begins to turn the tide against the ancient evil that controls King Malcolm and the rot.
The pivotal, climactic twist is the revelation of Kingfisher’s full, true identity. As the final battle rages, Kingfisher is challenged by an opponent (the one called Crave in the file) who states, “Only… half-gods may wield shadows”. This confirms that Kingfisher is not just a powerful Fae warrior but a being of immense, divine heritage.
His true name is revealed to be Khydan.
The Ending Explained: The Dragon Trade
The story concludes with a final, staggering act by Khydan (Kingfisher) to secure the ultimate salvation and security of his mate and his realm.
In a scene immediately following the climax, Khydan confronts Crave, a formidable enemy. Before leaving Saeris, he kisses her and says, “I love you, Saeris Fane,” signifying the power of their fated bond and his willingness to sacrifice everything for her.
He then makes a final, decisive move that reshapes the future of Yvelia. Khydan declares, “I’ve come for a dragon, as is my right. Summon our father. Tell him I’ve come to make a trade.”.
Explanation of the Ending:
- Khydan’s Heritage: This final line confirms that Kingfisher is a half-god (or a child of a god) and that his “father” is a powerful divine or ancient entity, likely the source of his shadow-wielding abilities.
- The Trade: The “trade” is the ultimate resolution to the conflict. It implies that to fully protect Yvelia and Saeris, Khydan must sacrifice something of immense value, likely a piece of himself, his freedom, or his loyalty to his divine parent, in exchange for a dragon—a creature of monumental power that can act as the ultimate defense and security for the realms they have just saved.
- Resolution: The ending leaves the reader with the conclusion of the immediate war, as the main threat is dealt with, but with an open-ended promise of future challenges and power dynamics. Saeris and Khydan are bound together as the new power in Yvelia, having passed through fire and brimstone, but their future is secured through a perilous divine pact. The romance is resolved (they are fated mates and Khydan declares his love), but the power struggle with the gods has only just begun.
4. Brimstone Analysis
4.1Brimstone Characters
For me, Saeris Fane is the beating heart of Brimstone, and she’s at her best when she’s wrestling with the gap between who the gods say she is and who she actually wants to be.
In front of the mirror, she’s half-in awe and half-in disbelief at her own reflection—the curvier, stronger body immortality has given her, the pointed ears that prove she was always meant to be Fae, the knowledge that she is now “Fae. … a vampire.”
She’s also deeply pragmatic; she doesn’t want the Blood Court’s crown, but she recognizes that claiming it is the fastest way to stop the war, keep Fisher’s people from dying, and carve out a space where the weak aren’t automatically prey, which is very consistent with the girl who once stole water in Zilvaren because everyone else had decided she wasn’t worth the cost.
Fisher, by contrast, is all restrained violence and buried tenderness.
He thinks like a tactician and a predator, reading emotions by the “scent” they leave in people’s blood—happiness, anger, sorrow, lust—and cataloguing how vampires, Fae, and humans each betray themselves.
Yet he also prays to gods he claims to hate to “save the fox, save Bill” as he charges into a horde of feeders, and tells Saeris, with humiliating honesty, that there is very little he wouldn’t sacrifice to make her happy.
Taladaius is one of the most intriguing figures in the early chapters, and I completely understand why pre-release commentary is already bracing for a potential love triangle.
He’s Saeris’s maker and a Lord of Midnight who’s visibly caught between old loyalties (to Zovena, to Sanasroth’s traditions) and a genuine, almost gentle protectiveness toward his unwilling fledgling, while Fisher’s every instinct is to tear the court down brick by brick.
Carrion Swift, meanwhile, is chaotic good in high-Fae form: mouthy, vain, and seemingly cowardly, but the first to sprint for a window when he thinks he’s spotted Onyx in danger and the one who doesn’t hesitate to grab the fox mid-air even though it sends him crashing off Bill’s back into the ash.
The Blood Court ensemble—Zovena with her venomous grief act, Ereth the zealot, and the silent Hazrax—lean more toward archetype at first glance, but Hart seeds enough weirdness and history (Zovena and Tal’s past, the Hazrax’s refusal to accept vampirism, Ereth’s demon-god) that they feel more like ticking bombs than simple villains.
4.2 Brimstone Themes and Symbolism
Even from the partial text, several themes are already loud and clear.
The first is power versus agency.
Saeris becomes queen because a god and a vampire lord decide they’d rather have her alive and dangerous than dead and gone, and the rest of the book is her pushing back against the idea that survival must equal obedience.
Her coronation is drenched in ritual and spectacle, but she constantly interrogates what that crown actually lets her do, how much blood it might save compared with open war, and whether she can live with the compromises that come with it.
There’s also a deep thread of monstrosity and humanity running through Brimstone.
The vampires are terrifying, but the first one we meet is a suicidal courtier begging for a clean death because he “just couldn’t… face” the fire it would take to kill himself, and Fisher sees his execution as “a mercy.”
Saeris’s own body becomes a battleground: she’s stronger, more beautiful, and more powerful than she ever was under the suns of Zilvaren, but she’s also literally the thing she was raised to fear, and Hart lets her oscillate between pride, horror, and bone-deep grief over that transformation.
Symbolically, the quicksilver that gave the first book its title still haunts the edges of this one.
It’s both a physical barrier (the lethal river she can’t cross anymore) and a metaphysical reminder that the gods’ meddling has warped time, prophecy, and even song—Lorreth’s ballad about Ajun is gone, eaten by the magic that reforged his sword, and Saeris hears whispers from the metal itself when she tries to ignore her destiny.
Lastly, there’s the theme of chosen family and found loyalty.
Fisher’s tiny praying mantra—“save the fox, save Bill”—says more about his priorities than any speech, and the way the warriors, Carrion, and even Saeris’s fox orbit each other in the opening chapters sets the emotional stakes of the wider war: it’s not just realms and rivers at risk, it’s this weird, battered little family they’ve built.
5. Evaluation
Strengths / pleasant surprises
For me, the biggest strength of Brimstone is Hart’s voice.
She moves effortlessly from grim battlefield banter (“I do it for those you have feasted on. Enjoy hell, tick”) to swoon-worthy confession (“There isn’t much I wouldn’t sacrifice to make you happy, Osha”) without losing the characters’ edges.
The early Sanasroth chapters are also remarkably vivid; you can feel the crunch of ash under Bill’s hooves, smell the petrichor Fisher associates with Saeris’s emotions, and see the grotesque carved faces in the Hall of Tears watching the court tear itself apart.
I also really liked how unapologetically sensual and body-positive Saeris’s gaze is.
She notices her own curves, her lovers’ scars, and even appreciates the craftsmanship of her murder dress, which grounds the high stakes in something tangible and human.
And finally, I think the series benefits enormously from being situated within a genre that’s exploding in popularity: readers who love Sarah J. Maas, Rebecca Yarros, or Jennifer L. Armentrout are already trained for multi-book arcs, high emotion, and messy politics, and Brimstone leans into that in a way that feels deliberate rather than cynical.
Weaknesses / where it may struggle
I have to rely on pre-release criticism here, and it’s worth stressing that some of it is speculative.
The Book Axis piece, for example, argues that separating Saeris and Fisher for much of the book risks gutting the series’ main appeal—their banter and slow-burn chemistry—and frames the hinted Taladaius–Saeris tension as potentially formulaic.
There’s also a structural risk baked into “queen in one place, lover on a quest elsewhere”: if one storyline drags or feels repetitive (for instance, too many scenes of Fisher playing straight man to Carrion’s non-stop jokes), readers might start skimming, which is rough in a 670+ page novel.
From the small portion I’ve read directly, Hart does sometimes lean hard on exposition and internal reflection, especially when explaining the Blood Court’s rules and the Lords’ rings, which could tip over into density for readers who prefer cleaner, leaner fantasy plotting.
Impact (emotional / intellectual)
Even with partial access, I felt a surprising punch in the quieter moments: Saeris’s tears when she thinks Fisher is going to mercy-kill Onyx, Fisher’s panic masked as irritation as he races across ash, the way he almost casually gives up his healing magic because, deep down, he doesn’t expect to survive this war anyway.
On a more intellectual level, I appreciate how the series forces the question: if your survival depends on becoming what your oppressor worships (a vampire queen for the court that slaughtered your people), do you owe anything to the identity that body gives you.
And there’s something oddly moving about reading such a high-angst, trauma-laden romantasy in the context of recent research showing that fiction, especially emotionally intense stories, can genuinely strengthen empathy and help people process their own hurt in a safe, symbolic way.
Comparison with similar works
If you’ve read A Court of Mist and Fury, From Blood and Ash, or Fourth Wing, you’ll see familiar bones here: the monster court, the reluctant queen, the overprotective but deeply vulnerable mate, the god-metal weapons.
Where Hart feels distinct to me is the sheer blue-collar grit of her settings—Zilvaren’s water thefts, Sanasroth’s ash plains, Ammontraíeth as a prison-fortress—and the very specific humour in the dialogue, which is dryer, more British, and more profane than a lot of US-market romantasy.
I’ll also note that, despite your request, I couldn’t find any substantive discussion of Brimstone or Fae & Alchemy yet on probinism.com; if anything goes up there later—an essay, a review, or a cross-genre piece—that would be a great place to link for further reading, but right now there simply isn’t relevant material to cite.
6. Brimstone Quotes
- “A wolf was a versatile creature. Adaptable.”
- “The dress was made for sinning. Black. Strapless. Sheer.”
- “I was Fae. I was a vampire.”
- “You will always be enough.” — Fisher remembering his mother’s words as he tries to heal Onyx.
- “There isn’t much I wouldn’t sacrifice to make you happy, Osha.”
- “My name is Saeris Fane, and I am your queen.”
7. Conclusion
On the basis of what I can see and verify right now, Brimstone looks like a bigger, darker, and more politically tangled continuation of Quicksilver, doubling down on vampire horror, god-metal symbolism, and the messy reality of what it means to be in love with Death while ruling a court built on blood.
I would recommend it especially to readers who loved the first book’s banter and brutality, who enjoy Sarah J. Maas–style court intrigue and Rebecca Yarros–level emotional stakes, and who are comfortable going into a sequel that almost certainly will not wrap everything up neatly in one volume.
What I can’t honestly do, yet, is hand you a full, ending-explained breakdown of all 700 pages, because neither my access to the manuscript nor the current state of the internet gives me that data—but if you’re willing to live with a bit of mystery, Brimstone already feels like one of those cultural touchstones that will dominate romantasy discussions for the next couple of years.
