Can you keep a secret? Bryn Matthews believes the strange senior pranks happening on the last day of high school are no joke. Her two best friends think she's overreacting. Then pictures from their past begin to reveal a dark secret. The girls soon realize they are the target of a twisted game. Someone is watching them. As the day unfolds, the pranks become more sinister. Screams haunt the hallways and the secret that is supposed to be dead and buried, creeps closer to the surface...bones and all. Nothing is what it seems and only one thing is for sure: No one can be trusted.