Breaking Emma by J. Flanagan

When Emma Ashford was ten years old, she witnessedsomething that altered her world forever. She's beenrunning from the man she saw in her housethe night one of her best friendswent missing. A decade laterEmma can barely remember who the man is.Or why she can't go home.Years of isolation has made Kane Andrews themost ruthless boss of The Five Families.He's never forgotten the day he found his sister's dead body.He's lived his life haunted by the blank look in her eyes.Now that he's in charge,Kane finally has the opportunity tobuy the information he needs to avenge Hallie.Information that is paid for,but never delivered.