The Queen of Everything by Deb Caletti

High school junior Jordan MacKenzie's life was pretty typical: fractured family, new boyfriend, dead-end job. After her parent's divorce, Jordan felt like she finally had as normal a life as she could. But then came Gayle D'Angelo- her father's new girlfriend, who is married to another man. And how could she -- how could anyone -- have possibly guessed that this illicit love affair would implode in such a violent and disturbing way?