Not Mine to Keep by Brittney Sahin

Calliope, or Callie, only recently learned of her father's identity at her mother's funeral. She is the only heir to the DiMaggio Mafia family and her father is dying. He's determined to marry her off to a monster so she can create a new generation, but that's the last thing she wants. She's avoided it so far, but then a stranger in a bar informs her that they plan to take her that night and force her home. 

Alessandro is the playboy of the Costa family and doesn't believe in marriage or relationships, but in order to exact revenge on the DiMaggio patriarch, he has to fake a marriage to Callie to save her from the man who tried to unalive his oldest brother. But as time goes on and they both fight to stay alive, he has to remind himself that she's not his to keep. 

I like this continuation of the Costa family story as I loved Enzo and his story. The suspense and spice are perfectly balanced to create an engaging story and unique characters kept me interested. I look forward to the next book.