19-year-old Tommy is a foul-mouthed, drug-abusing delinquent with a penchant for antisocial behaviour and violence, both of which he records and uploads to his
Instagram Profile Page. During a night out with his girlfriend Gabby, Tommy becomes heavily intoxicated and is separated from his friends. He is then abducted on the street by an unknown assailant.
Macedonian national Rina meets with a man named Chris to interview for a housekeeping job. Chris invites her to his large countryside home where she signs a non-disclosure agreement and undergoes a tour of the house, meeting Chris's reclusive wife Kathryn and their 10-year-old son Jonathan. While viewing the cellar downstairs, Rina discovers an unconscious Tommy chained to the wall. She attempts to flee, but Chris stops her and says he is aware of her past and precarious visa situation. Following a threat to call his contact in the
Home Office, Rina agrees to take the job. Tommy is revealed to have been in the house for some time. He regularly antagonises and threatens Chris, and attempts to reason with Rina for help when she works in the cellar. Chris forces Tommy to watch educational films starring Chris and his family, as well as clips of Tommy's antics uploaded online. Tommy maintains his abusive demeanour, to which Chris responds with kindness and lectures, claiming that he is trying to help Tommy become a better person, though he shows no reluctance in beating or tasing Tommy whenever he resists his captivity, such as when he throws his urine-soaked clothes at Kathryn. As time passes, Kathryn begins giving Tommy books to read and the family allows him to watch movies with them. His temperament calms and he slowly builds a rapport with everyone in the household, especially Jonathan. After celebrating Tommy's birthday with a picnic, Chris moves him to a room upstairs, having constructed a ceiling-mounted track system to which Tommy's chain is attached, allowing him to move throughout the house. However, Chris has also inserted combination locks throughout the track to control Tommy's movement and prevent him from going downstairs unsupervised. Rina confides in the family that she is being followed. They invite her to move into the house. At Tommy's urging, Chris employs his and Rina's assistance in arranging a romantic dinner for Kathryn in the back garden. Though this is a success, Tommy steals a knife from the kitchen drawer as the family is distracted and hides it in a potted plant. Upstairs, while Chris thanks him for his help, Tommy asks why he in particular was abducted. Chris does not give a straight answer. Tommy states he is aware that his room once belonged to someone else. One day, when Chris goes on a drive, a gang of men break into the house seeking Rina. She agrees to leave with them, though before doing so she whispers the code to the locks in Tommy's ear. Tommy then attacks the men but they overpower him. When Chris returns, he thanks Tommy for protecting 'their' family, and reveals his plan to install a security system and motion detectors on the property. That night, Tommy opens the combination locks and sneaks downstairs, taking the hidden knife and using it to pry his chain from the track. Chris comes down with a handgun, but Tommy attacks from behind and disarms him, after which Kathryn arrives. Tommy asserts he will never be the person who used to live in his room and demands to go free. Heartbroken in her husband's arms, Kathryn agrees to let Tommy leave. Having returned home, Tommy does not admit to police that he was abducted and claims he went away with his friend 'Jonathan'. He encounters Gabby in a nightclub, heavily intoxicated from drugs and alcohol. She confesses the next day that she wishes she could 'disappear', and Tommy asks if she trusts him. When she assents, he incapacitates her with chloroform and takes her to the gate of Chris's home. After Tommy rings the buzzer and waits anxiously, the gate opens and he walks towards the house with Gabby in his arms. ==Cast==