Its Halloween 1989, best friends Sam and Josh are trying to enjoy what's left of their final Devil's Night before graduating high school. But trouble arises when the two pals and a group of friends take a detour on their way to a rock concert, finding an old abandoned barn and awakening the evil inside. Now it's up to Sam and Josh to find a way to protect their friends and defeat the creatures that lurk within "The Barn".

When a young woman overcoming her traumatic past is among several witnesses who see a man fatally assaulted and don't intervene, they find themselves targeted by someone, or something, out for revenge.