The psychological thriller 'Stalker' follows Oliver (played by John Connors), a homeless man who wanders around Dublin where he meets and befriends a teenager named Tommy (Barry Keoghan). Tommy is bullied by not only the boys who live in his area, but also by his uncle (Peter Coonan), an upper class drug dealer, and he has a drug-addict mother to take care of. A victim of abuse himself, Oliver sees Tommy's innocence and desperately wants to preserve it, to the point that he becomes increasingly involved in the young boy's life.