Underworld Fanfiction Crossover Novels & Stories

I was supposed to marry his son... But the Mafia King wanted me for himself. When Selene Marcellus walks in on her boyfriend cheating, her life shatters. But things only get worse when his father Caspian Santoro, the cold and powerful Mafia King shows up with a shocking truth: Selene’s real father is a Mafia don, and a war is coming. To protect her family, Selene agrees to a fake engagement. But nothing about this new life feels fake. Especially not the way Caspian looks at her. Controls her. Owns her. Caspian Santoro is power, danger, and sin in a suit. The more Selene fights him, the deeper she falls. But the underworld has plans for her and so does Ivan Sokolov, the Russian boss who’s not what he seems. Trapped between three men, two empires, and one deadly secret, Selene must choose: burn for love or kill for it. In the Mafia world, blood isn’t thicker than power. It’s the price of survival.

Jenna is perceived by the outside world as a sexy, spoiled woman who has gotten whatever she wanted. She was the only child of her Alpha parents and they wanted nothing more than for Jenna to settle down and become Luna to the Black Crescent Pack. What few people realised was Jenna is a kind-hearted woman who has healing powers. She does a lot of charity work outside of her circle and wants to be a doctor for humans and werewolves. Few really know Jenna, including her fated mate. When they meet, Adam instantly hates all that he thinks she is. But he does need a Luna to solidify his spot as Alpha for the Red Pine Pack. Jenna and Adam decide on a short-lived truce to help each other get what they want. Little do they know Jenna’s healing powers make her a target for an underworld waiting to capture her to use her talents. Will their growing attraction to one another save Jenna? Is a rejection in their future? Only time will tell in Healing Powers.

By day, Carlotta spins stories. By night, she serves drinks. Her life was simple. Until her good-for-nothing brother offered her as collateral to pay off a massive gambling debt to a ruthless underground casino. Now she's the reluctant fiancée of a powerful mafioso rumored to have a cruel streak... and a bedroom secret that's the talk of the criminal underworld: erectile dysfunction. Carlotta would've found it funny if it weren't her life on the line. To make things worse, fate throws in another complication: her dangerously attractive new driver-slash-bodyguard. With abs worthy of a thirst trap and a face that screams "Asgardian demigod". He's the kind of temptation a woman in her situation absolutely does not need. Just when she thinks it couldn't get more absurd, her cold, mysterious fiancé summons her to his penthouse suite with one chilling demand: He wants a taste of what's been promised. Her.

First of all, she was his slave and then he enslave her heart. Having her memory sealed, Ariana neither believed in the existence of a witch nor a werewolf, well, that was until she saw the man who had cruelly taken her innocence turn into a wolf and killed three people right in front of her. In the human world, he's simply Dylan Sabastine, a business tycoon but in the underworld, he's an Alpha, ruthless, merciless, and formidable personality. He answers to no one but his heart was soon captured by his unwanted mate. What will happen when he finds out that his mate is a witch and she also finds out that the man who was responsible for the death of her mother and all her sufferings is the same man whom she loved with the whole of her heart, will her thirst for vengeance overcome her love and is he ready to have a witch as his Luna? Find out in this story where hatred turns to love and love turns to hatred.

When Mafia boss Leo Vance becomes the target of a new head of the investigation team, his childhood friend turned enemy, Omar, employs a junior agent, Mae Yrote, to eliminate Leo. However, Mae's mission takes an unexpected turn when Leo captures her, leading to a dangerous game of cat and mouse. As Mae attempts to carry out her mission, she uncovers the dark underworld of Leo's operations and finds herself entangled in a complex web of deceit and betrayal. Both Leo and Mae struggle with their growing feelings for each other, adding another layer of tension to their already precarious, dangerous situation. Mae must navigate between her duty to the government and her conflicted emotions for Leo.  A story where loyalties are tested and destinies are intertwined in an unexpected twist of events. The boundaries between predator and prey blur against a shadow of love, betrayal, and redemption as Leo and Mae's destiny crosses path.

“I wish I had not met you once more” After the tragic death of his fiancee, Cullen Anderson raged a war against death that sent him to the underworld, where the Daimons lived. Cullen found favor in the eyes of Thanatos, the god of peaceful death and made him a grim Reaper as his punishment and his second chance. If he fails, his soul will vanish forever. One hundred souls to go, and mission accomplished, but then he encountered Paige, a Filipino-British model. She is the reincarnation of Cullen’s fiancée, Amari, who was brutally killed almost ten decades ago. She was reborn to torment Cullen’s soul once more. One of the Daimons wanted to erase Cullen in eternity forever. But why? Will history repeat itself? Will Cullen win against the plot of the minor gods? Brace yourself as you read the Grim Reaper's diary! The untold stories of darkness, you have never heard before.

In a world where Humans rule the day and Werewolves the night, lies the fate of an Alpha king Lucien who had been cursed by a witch to never have an heir succeed him— a curse he acquired through his father many years ago and a situation that has left him ridiculed and disrespected amongst his own people, and his brother, wanting to dethrone him. As the humans go about their normal day-to- day- activities, the Lycans hunt at night for the unlucky humans. To the Lycans, humans are needed and usually looked down upon as merely slaves or breeders for more slaves and nothing more. Little does the Alpha king know that the death of his curse lies in the hand of that one human. But how was a mere slave able to cure him when not even the most powerful witch in the underworld could? What will become of the human breeder's fate knowing she's now a threat to the throning of the Alpha's brother? Will she also be able to break the second curse?

Iris Hale is hiding a secret even she doesn't know: She is The Ledger. Born with a photographic memory, Iris is the ultimate prize in a bloody underworld war. For decades, five rival Mafia families have hunted her bloodline, ready to tear her apart to get the secrets locked inside her mind. Dante Vitale is a man of shadows and cold steel. As the ruthless heir to the Vitale empire, he has one mission: find The Ledger and use her to crush his enemies. But the woman he finds isn't just a weapon—she’s the only person who makes him feel human. Now, Dante faces a choice: use her to win a war, or start one with every family in the city to keep her safe. But Iris is about to learn that her protector is the same boy who survived the fire that killed her mother. And in the mafia, the only thing more dangerous than a secret is a man who will burn the world down to keep it.

“I fix things that need fixing. And you, Raven, are broken.” When his best friends Vice and Victor ask Raven, a PI, to investigate Gregory Holmsworth, the estranged grandfather of Vice and Victor’s girlfriend, Mirage, Raven is drawn into the underworld of the music industry. Although on the surface Gregory Holmsworth’s business seems legit, his path has not always been on the right side of the law. When Raven’s investigation is noticed, Gregory sets Vixen to distract him. Vixen is Gregory’s Fixer, a role which is wide and varied in activity, but for Vixen, mainly involves the music side of his business, as Vixen is the lead singer of a punk band just breaking into the industry. Whilst Raven has been looking into Gregory, Vixen has been looking into Raven, and she sends him an invitation to meet with her, luring him with the promise of a way into Gregory’s business and secrets. But Vixen has other plans for Raven. She likes pretty boys, and broken things, and she has decided that Raven fits both descriptions to a tee.

Madelyn Davenport has never backed down from a challenge. Fierce, brilliant, and driven by justice, she makes headlines with a fiery speech that rattles the elite—and catches the eye of the most dangerous man in the city. Wyne Moretti is more than just a cold-hearted CEO. Beneath the polished surface lies the ruthless king of the underworld, a man used to getting everything he wants. Amused and intrigued—by Madelyn's defiance, he offers her a position at his side. When she boldly refuses, he vows to make her kneel… only to find himself captivated beyond reason. As obsession replaces revenge, Wyne pulls Madelyn into his dark world, one seductive step at a time. But love isn't the only game at play. With secrets unraveling both must decide what they’re willing to sacrifice when the truth threatens to destroy everything. Power. Passion. Betrayal. In a world where nothing is as it seems, can love survive the shadows? A sizzling, suspenseful romance where danger and desire go hand in hand.