Who Locked Me in the Bathroom?!

Sixteen years after a little girl drowns during a childhood sleepover, a group of former friends reunites at the house where it happened. But when guests begin disappearing and a masked killer starts hunting them, they discover their host has spent years planning a deadly night of revenge. With old secrets exposed and a killer determined to punish the guilty, the survivors must confront their past before their final sleepover becomes their last.