Underworld Fanfiction Crossover Novels & Stories

Isabella has spent her nineteen years trapped in a gilded cage, never knowing freedom, always under the oppressive control of her father. Using her mother as a pawn, he manipulates and confines her, forcing her into a marriage with a man she doesn't want. Her life is one of obedience, secrets, and silent rebellion-until Landon Volkov enters it. Landon is an FBI profiler with ties to the shadowy underworld, a man everyone fears and no one dares cross. Cold, controlled, and lethal, he has always kept the world at arm's length-until Isabella awakens something in him no one else ever could. Drawn together by danger, desire, and an unspoken understanding, Isabella and Landon are pulled into a high-stakes game of power, obsession, and self-discovery. As their connection grows, Landon becomes obsessed with the real Isabella-the girl behind the cage, the one who refuses to be silenced. But in a world where control is currency and betrayal lurks around every corner, can Isabella claim her freedom without losing herself... or the man who might destroy everything for her?

She was set up for murder, betrayed by her ex and her best friend... Framed, broken, and left to rot in a hospital bed. Sally had no one left… Except him. Dante 'Doom' Castillo. He was feared by the underworld, worshipped by the mafia, he was her father’s brother, her forbidden obsession. The one man who swore to protect her but not out of love, he wanted something she never even knew she had. A key. To a secret so dangerous, it shattered everything she thought she knew about her life. The fake murder, the betrayal, the inheritance, and the seduction was all a carefully orchestrated game designed to make her run straight into his arms and she did but Sally was done being played, because now she knows what he’s hiding. What he became the moment she shattered the one thing he needed most... Now he’s unstoppable and unkillable. And the worst part? She still wants him.

In the centre of the world of riches, guns and illegality. Stood a beautiful man with temperament as cool as sea and anger as violent as a tsunami. Eyes as deadly as an eagle and stare ,scary enough to bring half of this world down on its knees. Born with a silver spoon and the next heir to the network of the biggest mafia's in the world was he, Vincenzo Giordano Accardi .......................................................... Surrounded by country side waste and petty thieves. With pockets empty but heart loaded. Stood a poor girl with an average face. Heir to her father's debts and a mere room in the slums at the outskirts of the city. With a smile on those chapped lips and hope in those big brown eyes was she, Amara Luca ...................................................... He had 3 simple rules which she broke one by one . Rule 1 To love family before everything Rule 2 To reward deception with death. Rule 3 To never fall in love ......................................................... "He was the king of the underworld while she was a mere player in it, But then rules are meant to be broken when hearts overweight brains and deception plays its game." ...............................................

Gael Greyson, the heir of a multibillion company died in an accident buy found himself wandering in the streets until he realized someone can see him. San, a pitiful doctor who was trying to live in the big city found the ghost of Gael who offer her money and I return she had to help him with few matters. San agreed to help the man and was found by the chairman of the company. She admitted to the man that she was Gael's girlfriend and their relationship was kept hidden for her safety. The old man brought her to a room where Gael was lying on the bed in a coma. He asked her to bear his grandson's child as there was no chance Gael could wake up. Now, she had to help the man who was in coma but only she can see him. Will she be able to help Gael and wake him up from coma? Will they find his killer? Why only she can see him? What if the man is not what she thinks he is? What if he is indeed a cruel underworld king who likes to rule? There are a lot of secrets but one thing is common and that is love.

Everyone knew that the mafia family's second son, Luca Romano, loved Serena Vitale to his very bones. Five years ago, Serena climbed into bed with the Romano family's eldest son, Adriano Romano. Photos from that night spread everywhere, but Luca quietly suppressed them all. Four years ago, Serena gave birth to Adriano's child, but Luca raised the baby as his own. He could forgive Serena for anything she did, as long as she loved him. The underworld whispered that Serena stayed with Luca not out of love but to grab at the mafia's power and influence. Luca did not care. He poured every ounce of his strength into treating Serena and the child well, but it was not enough. Serena became Adriano's caged canary instead. The night they broke up, she threw his illegitimate birth in his face to humiliate him. Yet she willingly, even gladly, let herself be imprisoned by Adriano, enduring the wax and the whips. Everyone cursed Serena for being shameless and desperate, but she was the only one who knew the bitterness she endured.

They say opposites attract. Yet, Raffaele and Edwina avoid each other like the plague. Physically present, but lost in separate dimensions—two forces resisting, yet desperately needing each other to survive. They are each other’s equilibrium, just as fire needs air, just as heat demands the cold. They know it, but they fight it. Raffaele Marcello is the undisputed King of the Italian Mafia. A ghost in the underworld, ruthless and untouchable. One look in his eyes, and you’re as good as dead. He is a killer who has carved away parts of himself just to survive. Blood stains his hands—someone, somewhere had to die for him to live. He is his own law, the embodiment of power itself. Edwina Gemstone is fire wrapped in elegance, a force to be reckoned with. Sassy, sharp-tongued, and unapologetically fierce, she never bows to anyone. Success drapes around her like the finest diamonds, and she wears it with the confidence of a queen. But to touch her is to invite scars—she burns, and she does not regret it. Different paths. Twisted fate. A collision inevitable.

"You don’t need to see the world to survive it," Lucian whispered. "You just need to belong to the right monster." Seraphina Vellaro, blind, limping, and silenced by years of cruelty, is the forgotten daughter of mafia queen Celeste Vellaro. After her mother's brutal death, she is imprisoned by her father Danta, a sadistic man desperate to seize control of Celeste’s legacy. But fate changes course when Seraphina’s loyal nanny Gloria escapes with a powerful relic—Celeste’s blood-coded journal—and places it in the hands of the most feared family in the underworld: the Morettis. Now under the protection of Lucian Moretti, a scarred mafia prince cold enough to make death shiver, Seraphina becomes the key to a buried empire—and the center of Lucian’s growing obsession. He doesn’t love her. He claims her. But in a world of velvet prisons, power-hungry enemies, and dark inheritances, Seraphina must decide: Is she still someone’s pawn—or will she rise as the queen her mother raised her to be?

Rejected and destroyed beyond words, Amora finds her way to the big city, abandoning her war and darkness torn pack. Fate had it way and she crossed paths with her second chance mate, Deven who is consumed by hatred and marks her as his enemies. She is a werewolf and he is a hybrid creature, a werewolf and vampire mixed. She lives like a normal human in the human world because of how her mate rejected her which caused the whole park to also reject her. He is a mafia boss and he rules the underworld in the human and werewolf world ruthlessly but sweetly in the vampire world. The werewolves from his mother side killed his entire family, he is known to hate the werewolves so much and doesn't hesitate to clear them. Revenge and vengeance was heavy on their mind as they saw they had the same enemy. Tired of hiding and ready to deal with his enemy, he joins hands with Amora to fight him but now, they are not only facing their enemy as they unravel secret on secret.

Imagine being sent to kill the most ‘unkillable’ man in the underworld—The Big Bad Alpha. If you fail, he kills you without mercy. And everyone else who ever tried failed. How then can you, a lone female assassin, kill this monster? You decide to do it against all odds but when you get there, BOOM! The deadliest Alpha alive is your mate. Wayne Knight stepped into the room and Olive's heart thudded loudly. He was the most powerful Alpha in the country, and she was sent to assassinate him. But she failed and was caught, which meant he would not have any mercy on her. He was going to kill her mercilessly and ruthlessly. But why was she loving the scent of him since he stepped into the room? Why did she love his gaze on her despite being scared? And why was he not breaking his eye contact with her ever since he entered the room? Well, her wolf growled her the answer to all her questions...“MATE.”

He leaned in, inhaling her sweet scent as his hands traveled from her back to her waist, and then down to her thigh. She felt her breath hitch as she let out a small gasp. "We shouldn't be doing this." She said, her voice barely above a whisper. "Then tell me to stop." His voice was low, daring, as his fingers traced slow circles on her skin. *** Lucy had always lived life on her own terms, until the night everything changed. One moment, she was free; the next, she was bound to Barry Cooper, a cold, dangerous man who ruled the underworld with an iron fist. She never expected to be trapped in a world of power struggles, deceit, and unspoken desires. But as the lines between captor and captive blur, Lucy realizes she’s caught in a deadly game, one where trust is a luxury and survival is not guaranteed. Will she escape the ruthless mobster who owns her… or will she become his greatest obsession?