It starts as a prank a way to blow off steam after a long summer at Camp Horseshoe. Jo-Beth Chancellor suggests they scare Monica O'Neal a little...or a lot. Monica has it coming, and no one will really get hurt...

Twenty years later, Lucas Dalton, a senior detective with the sheriff's department, is investigating the discovery of human remains at what used to be Camp Horseshoe. Lucas knows the spot well. His father ran the camp, and Lucas worked there that infamous summer when two girls went missing.

Lucas knows he should step down from such a personal case. But maybe it's time to uncover the truth at last. That's why five former female counsellors are back in town - among them, Bernadette Warden, the woman Lucas has never forgotten.

Each one knows something about that terrible night. Each promised not to tell. And as they reunite, a new horror unfolds. First come texts containing a simple, terrifying message: You will pay. Then, the murders begin.