Deadly Intruder (aka The Deadly Intruder) is a horror film. In a place called...Midvale, a sanitarium becomes minus one patient, when one of those interred breaks out of said loony bin after dispatching security specialists there and heads off to looking for the love of his life. Our disturbed individual is obsessively jealous, slaying anyone whom he fears may be endangering his relationship with his current girlfriend. Can the police catch him before he catches up to her? The film was released in Finland as Murhaaja saapuu öisin and in West Germany as Der Tödliche Feind.