His Mafia Princess (Family First #1) by April Zyon

Gregorio Bosco worked his way up the ranks of The Family. He never had trouble killing, selling, or anything he was tasked to do. He’d been trained to take over for Giovanni when he stepped down, but that all changed when Alessandra was taken. She was the only good in his life, and he’d do anything in order to protect her—no matter the cost to anyone around him.

Alessandra Morello was born into a life that she didn’t understand. She thought she was the daughter of a wealthy industrialist, however she learned it was far from the truth. She’s pulled into the center of a war with Gregorio as her only constant. Her attraction for the older man has only grown over the years, but can there be a future for them in their twisted world?