Not Mine to Keep - Brittney Sahin

A playboy billionaire and a mafioso's daughter ignite dangerous passions, vengeance, and betrayal in a sizzling novel of suspense by Wall Street Journal bestselling author Brittney Sahin. The name DiMaggio means mafia royalty, but Calliope, the dynasty's last living heir, is no princess. A teacher and singer in Nashville, she's moved as far away from the generations-old criminal legacy as she can. But she still can't escape her dying father's wicked reach, or his plans for her arranged marriage to carry on the family name.
Playboy Alessandro Costa has a different plan: marry her himself-temporarily. It'll give him a chance to take down the DiMaggio patriarch and his empire, settle an old debt, and save Calliope from a catastrophic fate. But when the attraction between them sizzles, business becomes pleasure and a marriage game becomes the real thing.
It only raises the stakes-and the danger. Because now they are living in the shadow of violent men who'll do whatever it takes to destroy them. With their love and their lives on the line, Calliope and Alessandro are ready to fight fire with fire.