Best Books With Serial Killer OC Protagonists?

Thirteen years ago, Daniella watched her father drop dead right in front of her, his heart harvested and taken away. She watched his life drain away before her very eyes by the one man the world would never suspect. Since that very moment Daniella Cruz has lived her life for just one purpose—Revenge. At 18 Daniella was ready, she was trained, calculated, manipulative and a heartless being wanting to devour the soul who took the only one who mattered to her on earth. When she finally tracked down the man she believed destroyed her life, a powerful, untouchable billionaire with a dangerous and secretive reputation–she does the unthinkable. She enters home, as a disguised house help . Her plan is simple: get close, gain his trust and destroy him. But nothing goes as planned because the man she grew up to hating all her life is nothing like she imagined. He is cold, yes. Dangerous, maybe. But not cruel. Worse, he sees her, not as a servant, but someone worth protecting. And just something that started off as mere stealing glances, quiet conversation and something inside of her that she can’t explain. Daniella fell hard. She makes the one mistake she swore never to do. She fell in love with the man who killed her FATHER. A crazy turn of events, Daniella realizes that the truth is far more dangerous than the lie she has been living. Because he is not her father’s killer. And when the real monster finally stepped out of the shadows Daniella is forced to face a devastating reality: Revenge built her….. But love might be the one thing that would destroy her one question remains When the truth finally reveals itself will Daniella Cruz be able to pull the trigger?.

Sarah Killian is not your average thirty-year-old single woman. Foul-mouthed, mean-spirited, and a text-book-case loner. Also, she is a Professional Serial Killer. But a wrench is thrown into the clockwork of Sarah's comfortable lifestyle when, on her latest assignment, she is forced to take on an apprentice, Bethany—a bubbly, perky, blonde with a severe case of verbal-vomit. In short, Bethany is everything Sarah is not. Will Sarah be able to adjust and work with her new apprentice, or will she break her contract with T.H.E.M. and murder the buxom bimbo? ©️ Crystal Lake Publishing

LA, Land of Sunshine... Celebrities, Stardom ... and Serial Killers. Two twin sisters, struggling to get by in a world that reared its cruel ugly head when their older sibling was ripped away from them, without a trace, are suddenly thrown into a dangerous world when they come face to face with a gang of men who are single-handedly responsible for death and disappearance of hundreds of women across the United States of America. Now it's time for Ella and Peyton to face down the demons that roam the City of Angels, but, in the end, will they survive?

Dangerous. Forbidden. Unattainable. A cutthroat assassin on the run from the mafia is Olivia Hunter's decade-long crush. Eight years his junior, she's like a baby sister to him. He will never give her the time of day. Or so she thought. Until she woke up naked in her brother's best friend/new boss' bed. ### Brooding new COO of Hunter Industries Harmon Chancellor, is billionaire Will Hunter's found brother. These men would die for each other. Not fucking Will's baby sister was a given. A drunken moment of weakness and four years of restraint shatters. Harmon and Olivia fuck until dawn. Coming to his senses once sober, Harmon plans to escape on a business trip to Cupid’s Cove. He warns Olivia not to follow, but she stubbornly does anyway. Enter mafia princess/assassin, Robbie Marino. She's on a mission to drag Ghostblade home, by any means necessary. When Harmon learns that Olivia accidentally led the wildcard assassin straight to him, he's livid. He imprisons the spoiled billionaire's sister in his suite in a desperate bid to keep her safe. She wants answers he can't give her. He wants to fuck her forbidden pussy to shut her up so he can outsmart a mafia king. They can't both get what they want. Can they?

Detective Quinn Hale has seen her share of clean murders. But the moment she steps into Victor Blackwood’s study, she knows this case is different. Because this one is meant for her. As more bodies surface across different cities, the pattern becomes impossible to ignore. The victims have nothing in common until Quinn digs deeper and finds the one connection that changes everything. Now, with a chaotic but brilliant profiler, Damian, constantly pushing her limits, and her composed, unreadable boss Mark watching every move, Quinn is forced to confront a truth she’s been avoiding. This isn’t just a case she’s solving, it’s a message. And as the past begins to resurface piece by piece, one thing becomes terrifyingly clear- The killer isn’t just watching her, they’re waiting for her.

Reina Carlo was forged by the Stingers, a shadowy organization that raised her to be a weapon. Her memories of a family—a mother’s face or a father’s embrace—were long lost, replaced by the harsh discipline and ruthless training of her surrogate family. To her, the Stingers were everything, until betrayal shattered the fragile foundation of her loyalty. Now, Reina walks the streets as the hunter, her mission deeply personal. A man who dared to strip away her last shred of innocence must face the consequences. Her scars are tools, her training a guide, and by sunrise, her vengeance will be complete. But each kill leaves a stain on her soul, no matter how she rationalizes it. She tells herself the trade is fair: she removes monsters, and the world lets her survive another day. Redemption and forgiveness don’t belong in her world—they are luxuries for those unbroken by life. Yet the nightmares persist, whispering of a stolen past and a family that might still exist. Did they abandon her, or did they think her lost? These thoughts claw at her resolve, forcing her to confront a truth she can’t bury: forgetting isn’t the same as letting go. Her pact with Marco Alessandro—a powerful, calculating man—only adds to her turmoil. Their marriage of convenience grants her the resources to find her family and avenge her past. But Marco’s unrelenting gaze and quiet intensity break through her defenses, challenging the walls she’s built. As vengeance, love, and identity collide, Reina faces a choice: cling to the darkness she knows or risk everything for a future she can’t predict. In this world of shadows and betrayal, Reina Carlo fights not just to survive—but to discover who she truly is.