Let me be upfront with you, because Blackthorn deserves an honest reviewer: this is one of the most difficult books to rate I've encountered in a long time. Its Goodreads reviews read like transmissions from people who have witnessed something they cannot explain — a parade of "hey what the fuck actually," "what in the Jurassic Park f*ck is going on," and "I feel like I'm being gaslit." One reviewer simply wrote: "Forget motivational quotes, this book convinced me I could be an author too." Another described it as "Practical Magic and the movie Hereditary" having "a love child."
And yet. And yet. Despite — or because of — its glorious, unhinged descent into madness, I'm landing on a solid four stars, and I'm going to spend the next couple thousand words explaining exactly how a book this divisive earned it. J.T. Geissinger's Blackthorn is a gothic dark romance that opens like a prestige mystery, sizzles like a five-alarm enemies-to-lovers, and then, somewhere around the 80% mark, drives the entire plot off a cliff at high speed while you scream and refuse to close the book. It is a fever dream. It is a mess. It is extremely entertaining. Buckle up.
Overall Rating: ⭐⭐⭐⭐ (4/5 stars)
Spice Rating: 🌶️🌶️🌶️🌶️🌶️ (5/5 — and it takes a genuinely unexpected turn in the back half; you'll know it when you get there) Plot Rating: 📖📖📖½ (3.5/5 — a phenomenal setup with a finale that either dazzles or derails you, depending entirely on your appetite for chaos)
Plot Summary
Twelve years ago, Maven Blackthorn fled the small town of Solstice, Vermont, leaving behind the wreckage of her mother's suspicious death and the boy who broke her heart. Now she's back — reluctantly, for her grandmother's funeral, with her nine-year-old daughter Beatrix in tow — and stepping onto Blackthorn soil means stepping back into a nightmare she spent over a decade escaping.
The Blackthorn women have a reputation. The town has been calling them witches for a century, alternately shunning them and creeping to their door for herbal remedies. Maven's two eccentric, men-hating aunts still live in the crumbling gothic manor — think Practical Magic by way of the Addams Family — and the whole place hums with an eerie, candlelit menace. Then, in the book's fantastic opening hook, the situation escalates from "unsettling" to "genuinely wrong": Maven's grandmother's body vanishes from the funeral home. Naked. Out a window. With no explanation that technology, logic, or sanity can provide.
Enter Ronan Croft: CEO of Croft Pharmaceuticals, heir to a dynasty, brooding billionaire, and — inconveniently — Maven's first love, the son of the man her family suspects killed her mother. The Blackthorns and the Crofts have been locked in a generations-long blood feud, and Ronan is at the center of every raw nerve Maven has. He's also, it turns out, the father of her daughter, a fact Maven has spent twelve years hiding and is now lying through her teeth to conceal.
As Maven digs into her grandmother's disappearance and the string of "accidental" deaths that haunt the Blackthorn women, she and Ronan form an uneasy, electric alliance. Old secrets claw to the surface. A crumbling church on Croft land hides something terrible. And the deeper Maven goes, the more she realizes that the truth about her family — and Ronan's — is far stranger and more dangerous than a mere murder mystery. As one of the book's chilling refrains puts it:
"The most beautiful things in nature are those that will kill you the fastest."
To say more would spoil the ride, and the ride is the entire point. I'll only warn you what the veteran reviewers warn: read the trigger warnings first, and abandon all expectations at the door.
Character Breakdown
Maven Blackthorn is the reason this book works even when the plot is doing donuts in the parking lot. She's a lepidoptera curator with a PhD in entomology — brilliant, guarded, prickly, and armored in cynicism after a lifetime of being an outcast. Her family motto might as well be tattooed on her: "Men are only tools, and love is only for fools. It's just the Blackthorn way." Maven's defining trait is her spine of steel, and she wields it best against Ronan, refusing to let his "I was only a kid" excuses off the hook. When she reflects, "They taught me to fear myself before I feared anyone else," you understand exactly what this town and this family did to her. She's not a flawless heroine — her snark occasionally defaults to variations on "drop dead" when you wish for something wittier, and she's oddly wishy-washy with everyone except Ronan — but she's compelling, sympathetic, and fun to follow into the abyss.
Ronan Croft is the polarizing heart of the romance, and your mileage will vary wildly. On paper he's catnip: possessive, feral, devoted, a "touch her and die" hero who declares things like "You were never meant to be safe. You were meant to be mine" and "I would burn the world before I lost you twice." When the book lets him yearn, he's magnetic. The problem — and critics are loud about this — is that teenage Ronan treated Maven badly, denied their child, and then reappears twelve years later expecting to claim fatherly rights, and the book asks Maven (and us) to forgive him faster than many readers found earned. But there's a genuinely great scene, quoted widely, where he realizes the truth of their past — "You were in love with me... I thought you hated me... But you were in love with me. You loved me." — and pivots from arrogance to devastating tenderness: "Because if you loved me once, you can love me again." Whether Ronan is a swoon or a red flag depends heavily on your tolerance for the "mine mine mine" hero archetype. He's the book in miniature: divisive, intense, impossible to ignore.
The Aunts are a delight — wry, witchy, possibly hex-happy, and clearly cut from Practical Magic cloth. Beatrix, Maven's daughter, is a sweet and precocious kid, though she's shuffled off-page frequently so the adults can spark and combust. The supporting cast is thinner than the atmosphere deserves, but the two leads generate enough voltage to power the whole town.
Tropes
- Enemies to lovers (to enemies to...?) — the marketing's headline trope, though be warned: it's more "second-chance love reignited" than true enemies, since Maven and Ronan have history
- Second-chance romance — first loves reunited after twelve years and one very big secret
- Secret baby — Maven has been hiding Ronan's daughter, and lying about it, badly
- Forbidden love / rival families — full Romeo-and-Juliet, Blackthorn vs. Croft, generations of blood feud
- Small-town gothic — witches, curses, a crumbling manor, a town that burns its women (literally and figuratively)
- Possessive "touch her and die" hero — Ronan is feral about it
- Grumpy/grumpy — no sunshine here; two prickly people striking sparks
- Beauty and the Beast — thematically and, uh, more literally than you'd expect
- Dark magic / paranormal mystery — the slow creep of the supernatural into a seemingly contemporary story
- Dual POV — both Maven and Ronan narrate
Trigger Warnings
The author includes her own extensive content note, and it is not decorative. Per J.T. Geissinger herself, Blackthorn contains "dark themes and potentially disturbing content, including but not limited to graphic sex, noncon and dubcon sex, explicit language, possible harm to a child, human sacrifice, disturbing imagery, the occult, religion, violence, murder, incest, horror, blood, death, grief, and gore."
To break that down for prospective readers:
- Noncon and dubcon sexual content
- On-page ritualistic human sacrifice
- Graphic violence, blood, and gore
- Occult and religious horror imagery
- Incest (note: this involves secondary characters and a disturbing implied-sibling plotline; the FMC/MMC are confirmed unrelated, though this is handled murkily)
- Grief, death, and the death of a side character
- Possible harm to a child; deceased infants feature in a disturbing scene
- Body horror / "monster" sexual content in the back half that arrives with little warning
This is a book that fully earns its dark-romance-plus-horror classification. Do not go in expecting cozy gothic. Go in prepared.
What Works Well
The banter is genuinely, laugh-out-loud spectacular. If there's one thing nearly every review agrees on — even the one-star ones — it's that the verbal sparring between Maven and Ronan is elite. Readers report "cackling like a lunatic," "doubling over slapping my knee gasping for air," and declaring "this amount of snark should be illegal." Geissinger writes dialogue with a razor's edge, and the push-pull between these two crackles on every page. The extended exchange where Ronan reveals he impersonated a school principal to trick Maven's fake doctor — "I should wash that lying mouth out with soap." "Try it, and you'll end up missing a few important appendages." — is a masterclass in tension disguised as bickering.
The atmosphere is impeccably gothic. Solstice, Vermont, is a triumph of mood: eerie forests, candlelight and danger, a manor that's "part gothic mansion, part medieval fortress, part rustic ruin," a town with a century of buried cruelty. Readers compared it to Crimson Peak and Practical Magic, and the vibes are, per one reviewer, "immaculate." Geissinger builds dread beautifully, and the opening mystery — a body vanishing from a funeral — is a genuinely great hook that pulls you in immediately.
The tension and chemistry are combustible. This is a book people physically could not put down — reviewers confessed to reading it while working, grading, parenting, cooking, and driving. The slow burn toward that first kiss (around a third of the way in) and beyond is expertly stoked, and when the spice arrives, it's blistering. The heat rating is a legitimate 5/5, and the emotional charge underneath it — the yearning, the history, the it's-always-been-you ache — gives it real weight.
It is unforgettable. Whatever else you say about Blackthorn, it does not leave you. It's a book that takes "up real estate in your mind for days," as one reviewer put it. In a genre full of interchangeable billionaires and forgettable meet-cutes, Geissinger swings for the fences with something audacious and strange. That's worth celebrating even when the swing doesn't fully connect.
The audiobook is reportedly phenomenal. The duet/multi-cast narration (Connor Crais, Tara Langella, Veronica Pace) earned near-universal praise, with many readers saying it elevated the experience considerably. If you're on the fence about the format, that's the recommendation.
What Doesn't Work As Well
That last 20% is a genuine grenade. Here is the crux of the whole divisive-reviews phenomenon: the final act takes a hard, disorienting turn into full paranormal/body-horror territory that many readers found jarring, rushed, or outright baffling. The complaint appears in review after review — "the plot got on a motorbike and drove straight off a cliff," "it felt like two separate books joined together with some raggedy twine," "monster smut fever dream." The tonal whiplash from grounded gothic mystery to supernatural chaos is severe, and if you're not primed for it, it can feel like a bait-and-switch. I'm rating the book a four despite this, not because of it — the ride is thrilling, but the landing is genuinely wobbly.
The pacing is uneven. The first 40–50% is tight and gripping; the middle sags with stretches of banter-for-banter's-sake; and the finale crams a mountain of revelations into a handful of pages. As one reviewer noted, the resolution and answers are "relegated to an extremely rushed 20 pages," which makes the payoff feel less earned than the meticulous setup promised. Books this atmospheric shouldn't sprint through their own climax.
Ronan's redemption is thin, and the forgiveness comes too easy. The book's most consistent character complaint: Maven forgives Ronan too quickly given that he denied their child and treated her poorly as a teen. His "I was seventeen" excuse doesn't hold much water when, as multiple readers point out, she was seventeen too. Some grovel — some actual suffering — would have gone a long way. The romance's emotional foundation is asked to support more weight than it can quite bear.
The "enemies to lovers" label is misleading. Anyone coming for a true adversarial slow burn should recalibrate. Maven and Ronan have been mutually attracted since their teens; the only real obstacle is Maven's (justified) hurt and pride. It's more reignited-first-love than enemies, and the mismatch between marketing and reality frustrated some readers.
The ending is ambiguous in a way that will annoy plot-resolution lovers. The book offers two possible interpretations — supernatural or naturalistic — and commits to neither, leaving readers to decide "what the book means to you." For fans of open-ended, discuss-it-forever fiction (myself included, on a good day), this is a feature. For readers who want their mysteries solved, it's a maddening bug. There's also no traditional epilogue in the leads' POV, which frustrated many.
The Verdict
Blackthorn is a beautiful, bonkers, brilliant mess, and I mean that with enormous affection. It is a book that sets a five-star table — gorgeous gothic atmosphere, elite banter, combustible chemistry, a killer opening hook — and then, in its final act, flips that table over, sets it on fire, and dances in the flames while you sit there whispering "what the actual hell." Whether that finale delights or disappoints you is genuinely a coin flip, and the split of 27% five-star and a vocal contingent of one-stars tells the whole story: this is a love it or hurl it book.
So why four stars? Because a book that makes you laugh, gasp, shriek, recoil, and stay up all night — a book you cannot put down and cannot stop thinking about — has done the one thing fiction is actually supposed to do: it made me feel something, loudly and unmistakably. The flaws are real (rushed finale, thin grovel, misleading tropes, tonal whiplash), and they're why this isn't a five. But the ambition, the atmosphere, the sheer audacity, and that magnetic banter earn it a confident four. Geissinger took a swing most authors would never dare. It didn't all land. I respect it enormously anyway.
Read this if you love: gothic atmosphere, elite banter, feral possessive heroes, second-chance romance, paranormal weirdness, and books that leave you gloriously confused
Skip this if: you need tidy resolutions, dislike tonal swerves, want your dark romance grounded and realistic, or the trigger warnings above give you pause (heed them!)
Final thought: "You never forget your first love. Especially when he's also your worst nightmare." You won't forget this book, either — for better, for worse, and probably for both at once.
⭐⭐⭐⭐ out of 5 — atmospheric, addictive, absolutely unhinged, and impossible to look away from. Go in open-minded, read the content note, and hold on tight.
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