Principessa of Chicago by Bree Porter

In the outskirts of Chicago, there lives a royal family who have evil running through their blood and darkness in their souls. And now, they are at war.
Sophia is still reeling after the shocking news that left her relationship with her family and her husband in tatters. With the birth of her firstborn looming, Sophia finds herself isolated and alone in a new environment…and haunted by the other Rocchetti women who came before her.
But the FBI isn’t done with the Outfit yet, and they don’t plan to stop hunting down her loved ones until they are all gone. Armed with nothing but her cunning and beauty, Sophia must protect her family, her child and her husband, Alessandro, the man who betrayed her and the man she ultimately loves.
The past and future collide, promising violence, unless Sophia can find a way to save everyone she loves. Or will she have to make the choice: her sister or her husband?