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 . . .