Terrifying and thrilling, this tale of terror traces the trials of Pat (Anton Yelchin), Sam (Alia Shawkat), Reece (Joe Cole) and Tiger (Callum Turner), who are members of a popular punk band, the Ain't Rights, travelling through the Pacific Northwest.
After their gig is cancelled, local radio host Tad (David W. Thompson) arranges a show through his cousin, Daniel (Mark Webber), at a neo-Nazi skinhead bar in the woods outside Portland. After the show, Pat returns to the green room to retrieve Sam's phone and sees the body of a girl, Emily (Taylor Tunes), who has been stabbed to death by a neo-Nazi.
Pat calls the police, but bar employees Gabe (Macon Blair) and Big Justin (Eric Edelstein) confiscate the band's phones and hold them hostage in the green room. Gabe pays a skinhead to stab another to create a cover story for the police who respond to the call. He consults with bar owner and skinhead leader Darcy (Patrick Stewart), who decides to kill the band to eliminate witnesses.
The band overpowers Big Justin and hold him hostage, taking a boxcutter from his pocket and his gun. Searching for a way out, the band discover an underground drug lab, but the only exit is locked from the outside. Arming themselves with improvised weapons, they exit the green room into the empty club, but are attacked by a dog, which kills Tiger. Will any of the band members succeed in escaping from the green room with their lives intact?