This book is on pre-order until book delivery arrives. 
 
The Mafia's Bride (Women of the Mafia #1) by ED Crowe:
 
Used to doing as she pleases, consequences be damned, party-girl Sloane O’Brien is the rebellious youngest daughter of the most powerful Irish mobster in Boston. People flock to her and the tabloids love her.

Then, her father dies.

Now, she’s just a pawn for her eldest sister to use. Including being offered as a lucrative bride to their family’s rival, Alessio De Luca. It might be to broker a business deal between two warring families, but Sloane knows a leash when she sees it. And she’s not one to be tamed.

Lex De Luca is sin incarnate - with a past to match. In order to get her freedom, Sloane will have to sabotage her marriage to the dangerous heir apparent, doing everything possible to get him to reject her. Unfortunately, he likes her fight. A little too much. And he plans on never letting her leave.

Just as Lex starts to break down the barriers into Sloane’s heart, it’s discovered a traitor has been putting the blame on Lex and is causing tensions to rise between the two families. Knowing her sister doesn’t take well to problems, Sloane has a choice to make - stay with Lex and fight for their marriage and therefore their alliance, or for her coveted freedom. And she’ll have to do it quickly.

Otherwise, there will be war.