When Sierton High's cheer captain, Ella Moore, is found dead after a party, all eyes turn to the other seniors who were with her that night.Each one had a reason to want the white-blond Ella, a vicious bully, to disappear. Her boyfriend, Scott Russell, recently discovered that Ella was cheating on him. Lucy Aguilar resented Ella for stealing Scott from her. Naomi Chen was being blackmailed by Ella over information that could have destroyed Naomi's reputation. Then there's brooding outcast Isaac Caldwell, whose sister was driven by Ella's bullying to the point of attempting suicide a few years prior. Newcomer Dawn Foster, who just moved to Wisconsin, was also at the party but left before anything seemed amiss. As rumors spread, Dawn starts digging into her classmates' secrets for clues that could lead her to the murderer. In alternating chapters set three years in the past, shy, self-conscious freshman Hannah Smith joins the Sierton cheerleading team and immediately becomes the target of relentless mockery led by who else but Ella. The story begins as a typical murder mystery, but a chilling twist in the third act will make readers rethink everything they've read up to that point. Until then, it's up to Dawn's investigation and the tension between the past and present storylines to keep readers going, since most characters lack the depth to garner much interest. Central characters are white; Lucy is Latina, and Naomi is white and Asian.A dark and vindictive tale. (content warning, author's note) (Thriller. 14-18)