The Last Time I Lied by Riley Sager

What happened at summer camp didn't stay at camp and fifteen years later Emma is still haunted by not knowing what happened to her three roommates who simply vanished. Now years later, she is invited by the camp's owner to come back as an instructor. She accepts to hopefully help with closure and to make amends. The camp is just as she left it and with the original players back and three young roommates to look after, Emma is still haunted and needs answers. Every twist of the book pulls you deeper until, just like the game the girls play at camp, you can't tell what is the truth and what is a lie. Riley Sager knows how to hide the clues and where the bodies are buried!