A group of camp counselors looks forward to a summer of fun and friendship. However, their excitement turns into horror when a dangerous escapee from a nearby mental institution starts hunting them down one by one. As the counselors fight for their lives at Camp Palametto, they discover that their attacker is not just a man—he also carries a dark supernatural force. The situation grows tense as they deal with both the physical threat from the escapee and strange, eerie forces that seem to control the frightening events around them. They quickly realize that coming to Mary's Lake was a big mistake.