In a chilling, masterfully twisting new novel of suspense, the New York Times bestselling author of The Camp explores the dark side of friendship . . . “I pledge my own life and soul to The Sorority.”  Every school has its cool girls, and at River Glen High, they’re known as The Sorority. The name began as a joke, but it holds a grain of truth. Because they’ve made a pledge to protect one another . . . no matter what the cost may be.  The pledge to kill Ethan Stanhope—that was a joke too. But then Ethan died in a car crash on the night of graduation, along with his little sister. A tragic accident, they said.Private investigator Mackenzie Laughlin remembers the girls of The Sorority, though as a cop’s daughter, she was an outsider. Now, nearly ten years later, one of them is missing, and Mac is hired to find her. The accidents have started again too—if that’s what they are. Because Mac is beginning to realize just how much the Sorority sisters have to hide—and how far they’ll go to keep their secrets . . .