Set around Halloween, the film follows Mike as he tries to piece together the events of the night of the massacre, while avoiding the police and others who want him caught. As he investigates, he discovers secrets about the attraction, his co-workers and his own past, and must confront the possibility that he is responsible. Originally developed under the title October, the film is directed by Jeremy Saulnier, the director of Blue Ruin, Green Room and Rebel Ridge, with a score by Trent Reznor and Atticus Ross. The cast includes Cory Michael Smith as Mike, with Chase Sui Wonders, Sophie Wilde, James Badge Dale, Stephen Root, Imogen Poots and Macon Blair.