New York Times best-selling author Jenny Han won a loyal fan following with her Summer series, including We'll Always Have Summer. Here she teams up with Siobhan Vivian for an enthralling tale of revenge. Mary has been suffering for years from a traumatic childhood event—and now seeks vengeance on the boy responsible. Kat is fed up with her former best friend—the ultimate mean girl—and wants the bully to get a taste of her own medicine. Meanwhile, Lillia is determined to protect her younger sister from a guy's less-than-honorable intentions. Together, the girls plan their revenge—but the price of justice may be higher than they thought.