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Romantasy and dark romance you can read at no extra cost with a Kindle Unlimited membership, from tender monster romance to mafia and why choose. Each one was listed in Kindle Unlimited on Amazon.com and Amazon.co.uk when we checked in October 2026. Books join and leave Kindle Unlimited all the time, so look for the Kindle Unlimited badge on the Amazon page before you start.
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1. Haunting Adeline
H. D. Carlton · 2021
ScorchingAdultThe book most people mean when they say dark romance. Read the warnings first: it earns every one, and it ends on a cliffhanger.
This is the book people mean when they say dark romance. A writer moves into her great-grandmother's manor, and the man watching from the woods decides she belongs to him. It is obsessive, violent and very explicit; read the content warnings first, then decide if you're in.
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2. A Soul to Keep
Opal Reyne · 2022
ScorchingAdultA lonely skull-faced monster and the woman her village gave away. Very spicy, surprisingly tender, and the start of a long series.
Reia is the village bad omen, so when the skull-faced Duskwalker comes for his offering, they give him her. He's lonely, gentle in his own monstrous way, and nothing like she was told. Tender monster romance with a lot of gore around the edges, very explicit, and a guaranteed happy ending.
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3. Hooked
Emily McIntire · 2021
ExplicitAdultPeter Pan with Hook as the hero and Neverland as a crime city. Villain gets the girl, with a happy ending.
Peter Pan, but Hook is the hero and Neverland is a city run on crime. Wendy Darling walks into James's bar, and he sees the perfect way to get revenge on her father. Villain gets the girl, high spice, and a gentler entry into dark romance than most; still check the warnings.
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4. Gloam
Lily Mayne · 2021
ExplicitAdultA gentle giant of a monster and a raider who sets out to free him. Each Monstrous book stands on its own.
Rig lives in a raider camp in the Wastes, and when Collector Mary drives off with the monsters chained to her RV, he goes with her as her assistant to free one of them: Gloam, a huge, gentle monster with a cage locked over his head who can only talk through a notebook. Mary, and the cult behind her, turn out to be far worse than a cruel collector. Captivity, torture and an M/M monster romance on the road, high spice, happy ending.
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5. Den of Vipers
K. A. Knight · 2020
ScorchingAdultOne of the best-known why choose mafia books. Four men, one woman who bites back, very explicit.
Her father runs up a debt with the Vipers, the four men who run the town, and pays it by selling her. They expected a pawn; they got a woman who bites back. Why choose, mafia, very explicit, and some of the darkest content on this site, so check the warnings first.
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6. Dark Fae
Caroline Peckham & Susanne Valenti · 2020
ExplicitAdultA vampire hunting her brother's killer among the four fae kings of a cutthroat academy. Ends on a cliffhanger, so line up book two.
Elise is a vampire on a mission: one of the four kings who run Aurora Academy killed her brother, and she's going to find out which. Four dangerous men, a school where fae kill each other for status, and a murder mystery that keeps the pages turning. Why choose, high spice, cliffhanger.
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7. Darling Venom
Parker S. Huntington · 2021
ExplicitAdultA rooftop pact, a broken promise and a slow burn that takes its time. Darker in feeling than in plot.
Charlotte and Kellan met on a school rooftop on Valentine's night, both ready to jump, and made a pact to meet there every year instead. In the fourth year, he breaks it. Years later she crosses paths with his older brother Tate, a cold, controlled doctor carrying his own guilt. Grief-heavy and sharp-tongued, high spice, happy ending; read the warnings first.
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8. The Never King
Nikki St. Crowe · 2021
ScorchingAdultA grown-up, dark Peter Pan where the Lost Boys come for the last Darling. Why choose, very spicy, cliffhanger ending.
For generations every Darling woman has vanished on her eighteenth birthday. When Winnie's turns, the Never King and his Lost Boys come for her, and this time they don't let her go. A dark, grown-up Peter Pan, why choose, very explicit, cliffhanger.
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9. Painted Scars
Neva Altaj · 2022
ExplicitAdultA fake marriage to the Bratva boss, and he falls first. Mafia romance with a soft centre.
Nina's father stole three million dollars from the Bratva, and the price of his life is her: a fake marriage to Roman, the Pakhan, who needs a wife to show his enemies that the bomb that put him in a wheelchair didn't make him weak. She's an artist and a gifted liar, and he starts wanting the act to be real. Mafia marriage of convenience, lighter than most, high spice, happy ending.
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10. Pestilence
Laura Thalassa · 2018
ExplicitAdultShe shoots the first horseman of the apocalypse off his horse. He doesn't die. Enemies to lovers at the end of the world.
The Four Horsemen have come, and Sara shoots the first one off his horse. He doesn't die. He takes her prisoner and drags her across the country while he spreads his plague. Enemies to lovers at the end of the world, high spice, happy ending.
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11. Brutal Prince
Sophie Lark · 2020
ExplicitAdultAn Italian mafia daughter married off to the Irish heir who'd rather see her gone. Enemies to lovers with a lot of bite.
Aida Gallo sets a very small fire in the Griffin family's house, and to stop a war between the Italian and Irish mafias in Chicago she's married off to Callum Griffin, the heir who'd rather see her dead. Arranged marriage and enemies to lovers, dark, high spice, happy ending.