He forced a vow to end a war. He never expected to want the woman wearing his ring. On the night Seraphina Vale’s father vanishes, she is dragged into an arranged marriage with Luca Devereaux—the cold, lethal heir to a brutal mafia empire. To the world, their wedding is a peace treaty. In private, it is a battlefield. Luca thinks Seraphina may be the key to a stolen ledger powerful enough to destroy the city’s most dangerous families. Seraphina thinks Luca is just another beautiful monster in a tailored suit. She is wrong. He is worse. Because when gunfire shatters their wedding night, Seraphina is pulled deeper into a world of blood, betrayal, and old chapel secrets. And the more Luca protects her, the more dangerous he becomes—not only to his enemies, but to the carefully controlled life he has built. He should use her. He should not crave her. He definitely should not want to burn the world for her. But obsession has a way of rewriting the rules. Vicious Vow is a dark mafia arranged marriage romance featuring a possessive antihero, a sharp heroine, forced proximity, dangerous family secrets, high emotional tension, explicit open-door spice, and a guaranteed HEA.