Gail is forced to come to terms with Josh, her new stepson, at a remote country home. After stealing an evil talisman from a mysterious neighbor, Josh has sinister dreams of his dead mother, who commands Josh to murder Gail. When Josh's dad returns, he and Gail suspect that their son has been possessed by an ancient, bloodthirsty spirit. Is it too late to save Josh's life — or their own?

In the Summer of 1987, after a perfect day at the lake, two small-town teenagers are stuck with a broken-down car and in a fight for their lives when they cross paths with a violent stalker.