Six stoner best friends discover a viral video of a local teen who disappeared years ago from an alleged haunted house in their neighbourhood. Searching for one last adventure before graduating high school, the teens decide to investigate this local urban legend, only to discover this night could be their worst, and possible last, experience of their lives.

A cult kidnaps a young girl and sacrifices themselves by the locust moon. The girl awakes, surrounded by corpses. Years later, the locust moon rises again and the girl is captured by a surviving cult member, informing her demon is growing inside all these years.