For her first day of orientation, Dr. Tristian Mackenzie makes her way to the Silverdale Psychiatric Hospital for the criminally insane, where she learns of the strange series of cases from the similarly strange Dr. Moon.

Five girls, five best friends, all haunted by their past mistakes of an April Fools prank gone fatally wrong, meet again after two years for a summer week long getaway in the woods to reconnect and reconcile.