It's 1981 in small town Ohio and Rachel is ready for the event she has dreamed for since she was a little girl, her wedding day. However, a dark secret from her past is ready to come back into the spotlight. When Rachel was a young child, her twin sister Judy murdered Rachel's crush in cold blood, rocking the town to the core. Judy was subsequently confined to a mental hospital hidden from the world. The night before Rachel's wedding, Judy breaks free, leaving a trail of bodies in her wake. As the festivities commence, Judy shows up to tear everything apart, victim by victim, until it's just her and Rachel.