Vow of Ruin. The Marchetti Empire, #1

The summons comes at half past four on a Tuesday, which is how Sofia knows it is bad. She is twenty-four. She has a master's from Columbia, four languages, and a future she had quietly built away from her father's name. None of it matters by the time the study door closes behind her. The Bellinis owe Don Marchetti more money than the family is worth. There is one acceptable form of payment, and it is her.
Dante Marchetti expects a frightened girl in a borrowed dress. What he finds instead is a woman who looks him in the eye, gives him three conditions of her own, and walks out of her father's study without flinching. The wedding is in two weeks. The marriage is for life. He does not yet understand that he has just lost a negotiation he will spend the next year trying to win back. What follows is not the marriage either of them planned for.
In the silence of his Manhattan penthouse, in the library where Sofia reads after midnight, in the war that closes around them both as the Volkovs ask quiet questions in the wrong restaurants, two people who agreed never to need each other discover that they already do, and that the cost of admitting it may be higher than the debt that brought them together in the first place. Vow of Ruin is Book One of The Marchetti Empire, a slow-burn dark mafia romance series where each book follows a different brother and ends in a HEA.
Tropes: arranged marriage, forced proximity, slow burn, possessive mafia hero, morally grey hero, strong heroine, age gap, found family, Italian-American mafia. Reader note: This is a closed-door / fade-to-black romance. Expect emotional intensity, atmospheric mafia politics, and a deeply earned love story rather than explicit on-page content. If you read for the slow burn and the ache rather than the heat, this one is for you.