Austin, Texas, high school junior and talented runner Thea Soloman is still grieving after the murder of her cousin and best friend, Natalie. When Thea is invited to join a secret group called the Black Coats, she finds new meaning. Thea and her teammates are trained to take vengeance on men who have wronged women and gotten away with it, with the promise of exacting revenge of their own. Thea becomes consumed by the Black Coats and also finds love with handsome fellow student Drew Porter. But soon the dangerous missions, called Balancings, blur the line between justice and torture, and Thea soon discovers the Black Coats are much more than they seem.