A Grimdark Flintlock Fantasy
The Heretical Dark
Four lives. One forbidden power. A society built on lies.
A Grimdark Flintlock Fantasy
Four lives. One forbidden power. A society built on lies.
The Story
In the Ryker Dominion, science is scripture and even whispering the word magic can get you killed. But an ancient, forbidden power runs beneath the surface of everything — and four people are about to be pulled into its orbit, whether they like it or not.
He wanted to be a hero. Instead, he killed everyone he loved. Now he wields an ancient, forbidden power and all he wants is his fifty pounds of gold and a quiet place to disappear.
An aristocrat, a scientist, and a woman on a mission. The same dark power that Aethan wields murdered her sister. Now she'll tear apart the secrets of the Ryker Dominion to understand it — no matter what the church, the law, or God Himself has to say about it.
Born with nothing. She'll climb to the top of Ryker society even if it means sacrificing her own family. She's bound herself to Carlotte's ambitions, and by Carlotte's rise or fall, her fate will be decided.
All she wants is for the world to see her as she was meant to be. Then a terrible accident puts blood on her hands, and survival means crawling into the skin of another woman's identity — becoming someone she's not, to escape what she's done.
The World
The Heretical Dark is set in a world that blends 18th-century flintlock technology with the lawlessness of a frontier western. The Ryker Dominion is a society built on the belief that science is the word of God — and that the ancient force known as magic is the ultimate heresy. Those who wield it are hunted. Those who study it are condemned.
But the truth is more complicated than the church admits. Magic isn't just dangerous — it's woven into the foundations of their civilization. And the people who get too close to that truth tend to lose their minds.
This is a story about what happens when faith is weaponized, when curiosity becomes rebellion, and when all the power is in the hands of a few. It's dark, morally gray, and unflinching, with characters who make terrible choices for understandable reasons.
Reader Reviews
"This book really pulled me in. It's dark and messy in a way that makes you think without ever feeling pretentious. The story has that gritty, gunpowder fantasy feel with just enough weird magic and philosophy to make you stop and think. It reminded me a bit of Glen Cook or Mark Lawrence, but the focus on curiosity and truth gives it its own vibe."
— Tales with Atticus, Goodreads
"The book's strengths include its tight pacing, rich (but clear) world-building, a plot that feels expansive without becoming diluted or distracted, and distinct narrative voices. It's not always comfortable to be inside the heads of these characters, or in the world they inhabit, and as a reader I greatly appreciate that discomfort."
— Hannah Alexandra, Goodreads
"Zimmerman's flintlock world is grim, his themes heavy with faith, power, and moral ambiguity. At its core are flawed, haunted characters trying to make sense of it all. If you're into Glen Cook or Mark Lawrence, or just want something a little heavier and smarter than the usual fare, give this a shot."
— Pete, Goodreads
"What surprised me the most about this fantasy was how dark and very real the world and the characters themselves felt. They came off the page and felt like real people with real problems and flaws. Most people in real life are chaotic neutrals. The fuckups these characters make in this book are terrible and therefore very relatable."
— Peter Whetzel, Goodreads
"This book has to be my favorite read of 2025. If you like fantasy adventure like Lord of the Rings this book is definitely for you. If you love a good gut-wrenching twist and merciless killing of well-established characters like Game of Thrones, then strap in. It's so refreshing to see a fantasy novel written so well and with a fresh take."
— Tasha Newell, Goodreads
"One thing that stood out right away was how well William Zimmerman writes characters. They feel complex and very human. The mix of faith, fear, and curiosity made the world feel believable and added another interesting layer to the story."
— Clint Irvin, Goodreads
BookTok
@tales.with.atticus ✨Indie Author Spotlight✨ If you loved The Devils by Joe Abercrombie, read The Heretical Dark by @William Zimmerman | Author A dark, gritty flintlock fantasy where science is sacred, magic is heresy, and curiosity can get you killed. Brilliant, brutal, and philosophical, like Abercrombie’s grit mixed but DARK. For fans of indie fantasy and morally gray heroes. Shoutout to @Peter Whetzel Reads💙 📚🍉☸️🪷 for the five star recommendation! #booktok #fantasybooks #indieauthor #darkfantasy #indiebooks ♬ original sound - Tales with Atticus 📚
@charles.chapters REVIEW: The Heretical Dark by @William Zimmerman | Author A flintlock Dark Fantasy where you follow a cast of characters on an epic Journey to discover the origins of magic. Politics, addiction, and economics brings this cast together on an unexpected Journey where love, lust, magic, and death awaits. #Dark #Fantasy #Review #Booktok #TheHereticalDark ♬ original sound - Charles' Chapters 📖
At a Glance
Morally gray characters who make terrible choices for understandable reasons
Found family forged under pressure
Curiosity as rebellion against dogma
Power that comes with a devastating price
Trans identity explored with empathy and complexity
Faith, science, and the lies that hold a civilization together
Dark flintlock fantasy with a theocratic twist
A world where science is holy and magic is heresy
Multiple POVs that all hit differently
Action, tension, and slow-burn character growth
Sharp prose with moments of dark humor
571 pages — epic in scope, tight in execution
The Author
William Zimmerman is an author and playwright based in Seattle with his wife and cat. He went to school to become an actor and decided he preferred writing the stories to acting them out. He loves stories with real, flawed characters and has a particular love for grimdark science fiction and fantasy.
The Heretical Dark is his debut novel — the first book in a planned series. He's currently at work on the sequel.
If you'd like a copy for review purposes, or if you would like to read the book but can't afford it, reach out directly at will.zimmerman.j@gmail.com. He means it.
Available Now
Available in paperback and Kindle. 571 pages of grimdark flintlock fantasy.
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