My Black Heart

This is sort of like Suicide Squad, a 19 year old goes to jail because of killing her sisters fiancee. She finds a group of people in jail, and agrees to break out with them and help them get revenge... She never wanted to be in this place, as a killer, but she likes the feeling of belonging, and would do anything to keep the feeling forever. She hates to kill, but she does it to survive. Throughout the book she crush on a guy in the group, and finds the good side of his heart, and she would risk her life for him... But if she gets caught, she would have a life sentence in jail...