After a wild night out, 19-year-old criminal Tommy (Anson Boon) finds himself separated from his friends. He is kidnapped and is shocked to find himself waking up in an unfamiliar cellar with a chain around his neck. He soon meets the residents: a deranged family consisting of Chris (Stephen Graham), his wife Kathryn (Andrea Riseborough) and their teenage son Jonathan. This dysfunctional family sets out to correct Tommy’s unruly behaviour through a violent rehabilitation process. Meanwhile, Tommy desperately searches for a way out.