Four years ago, Brynn left Saint Ambrose School following the shocking murder of her favorite teacher—a story that made headlines after the teacher’s body was found by three Saint Ambrose students in the woods behind their school. The case was never solved. Now that Brynn is moving home and starting her dream internship at a true-crime show, she’s determined to find out what really happened.

Imogen lives at the Playa Grande Resort in Cabo San Lucas, Mexico. She spends her days working out in the hotel gym and telling other guests how she was forced out of Stanford. But Imogen isn't really Imogen. She's Jule. And she's on the run from something. Or someone. Which means...where is the real Imogen? Rewind: Jule and Imogen are the closest of friends. Obsessed with each other, even. Imogen is an orphan, an heiress; she and Jule spend a summer together in a house on Martha's Vineyard, sharing secrets they'd never reveal to another soul.

Pay close attention, and you might solve this. On Monday afternoon five students at Bayview High walk into detention. Bronwyn, the brain, is Yale-bound and never breaks a rule. Addy, the beauty, is the picture-perfect homecoming princess. Nate, the criminal, is already on probation for dealing. Cooper, the athlete, is the all-star baseball pitcher. And Simon, the outcast, is the creator of Bayview High's notorious gossip app. Only Simon never makes it out of that classroom. Before the end of detention, Simon's dead.

She’s always had a special connection to the place, even before she was old enough to attend. The camp is the lifeline of Roxwood, the small town she lives in. Alpine Lake provides jobs, money and prestige to the region. Few Roxwood locals, though, get to reap the rewards of living so close to the glam summer that camp, with its five-figure tuition and rich kids who have been dumped there for eight weeks by their powerful parents. Goldie's one of them.

There are no more cheerleaders in the town of Sunnybrook. First there was the car accident - two girls dead after hitting a tree on a rainy night. Not long after, the murders happened. Those two girls were killed by the man next door. The police shot him, so no one will ever know his reasons. Monica's sister was the last cheerleader to die. After her suicide, Sunnybrook High disbanded the cheer squad. No one wanted to be reminded of the girls they'd lost.