Castle Sin: Similar romance series

Brutal Birthright

by Sophie Lark

4.16 · 169 ratings

adult · fiction · book · romance · crime · contemporary · organized-crime · dark · enemies-to-lovers · new-adult · suspense · steamy · mystery · alpha-mc · audiobook · multi-pov · kidnapping · action-adventure · female-mc · slow-burn

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Hades Hangmen

by Tillie Cole

4.27 · 250 ratings

dark · biker · contemporary · fiction · adult · romance · book · new-adult · steamy · abuse · multi-pov · alpha-mc · crime · drama · spirituality · angst · cults · suspense · anti-hero · sexual-assault

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Bootleg Springs

by Claire Kingsley

4.48 · 117 ratings

humor · mystery · fiction · womens-fiction · family · drama · adult · romance · steamy · audiobook · contemporary · multi-pov · friends-to-lovers · small-town · suspense · book · murder · slow-burn · crime · new-adult

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Donovan

by Elizabeth Lowell

4.01 · 72 ratings

action-adventure · fiction · mystery · book · crime · womens-fiction · romance · adult · contemporary · audiobook · suspense · steamy · murder · humor · poc-mc · literary-fiction · second-chances · asian-mc

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Ruthless Games

by Callie Rose

4.23 · 70 ratings

stalking · book · reverse-harem · organized-crime · steamy · romance · audiobook · contemporary · fiction · crime · polyamory · dark · new-adult · harem · alpha-mc · disability · suspense · female-mc · young-adult · abuse

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Uncertain Saint's MC

by Lani Lynn Vale

4.31 · 68 ratings

humor · suspense · contemporary · audiobook · in-uniform · multi-pov · alpha-mc · small-town · romance · steamy · book · dark · biker · military · law-enforcement · adult · violent-conflict · war · action-adventure · fiction

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Jon's Mysteries

by A.J. Sherwood

4.36 · 91 ratings

law-enforcement · book · romance · supernatural · mlm · urban-fantasy · suspense · paranormal · contemporary · crime · lgbtq · fantasy · humor · fiction · action-adventure · psychics · mystery · adult · magic · audiobook

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Angel's Halo MC

by Terri Anne Browning

4.29 · 126 ratings

contemporary · romance · biker · adult · fiction · audiobook · book · steamy · new-adult · alpha-mc · suspense · crime · womens-fiction · cheating · friends-to-lovers · dark · mystery · domestic-drama · outlaws · abuse

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Dead Wrong

by Jami Alden

3.98 · 42 ratings

action-adventure · mystery · fiction · crime · adult · military · book · steamy · romance · contemporary · suspense · murder · dark · stalking · angst · alpha-mc · enemies-to-lovers · killer · female-mc · serial-killers

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Bayonet Scars

by J.C. Emery

4.06 · 84 ratings

biker · crime · fiction · suspense · alpha-mc · contemporary · book · steamy · organized-crime · romance · adult · abuse · dark · new-adult · friends-to-lovers · sexual-assault · drama · domestic-drama · cheating · betrayal

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Acquisition Series

by Celia Aaron

4.13 · 54 ratings

dark · adult · sexual-assault · crime · forbidden-love · fiction · enemies-to-lovers · suspense · alpha-mc · contemporary · multi-pov · book · steamy · romance · revenge · slavery · mystery · female-mc · blackmail · billionaire

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Sidewinder

by Abigail Roux

4.00 · 67 ratings

action-adventure · fiction · lgbtq · adult · military · mlm · book · romance · contemporary · humor · mystery · crime · war · violent-conflict · law-enforcement · steamy · friends-to-lovers · in-uniform · drama · male-mc

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Professionals

by Jessica Gadziala

4.24 · 119 ratings

alpha-mc · crime · fiction · adult · romance · book · suspense · contemporary · steamy · mystery · dark · multi-pov · womens-fiction · action-adventure · military · friends-to-lovers · organized-crime · slow-burn · war · female-mc

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Ties of Steel

by M.J. Fields

4.28 · 60 ratings

new-adult · adult · poc-mc · fiction · contemporary · romance · book · suspense · audiobook · steamy · dark · crime · mystery · organized-crime · family · female-mc · coming-of-age · billionaire · multi-pov · alpha-mc

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Caged

by D.H. Sidebottom

3.94 · 32 ratings

fiction · dark · adult · book · steamy · romance · mlm · suspense · anti-hero · crime · drama · death · sexual-assault · kidnapping · psychological · revenge · abuse · angst · alpha-mc · fighter

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