On the cold streets of London, when the sun sets and darkness falls, the Passion Killer strikes. By day, Joe is a reserved loner who keeps to himself, struggling with forming meaningful connections with the people around him. By night, he's a deranged, sexually frustrated psychopath targeting the city's celebrity impersonators following a traumatic incident from his childhood. One day, however, Joe finds himself consumed with obsessive desire for Mary, a young woman who imitates Marilyn Monroe for a living. With only a single photograph to remember her by, Joe will stop at nothing to have Mary all to himself and won't hesitate to strike anybody who gets in his way.