Un malade mental, obsédé par l'idée de devenir policier, ne rentre pas de "perm" à l'hôpital psychiatrique où il est soigné.
A psychiatric patient, obsessed by the idea of being a policeman, hasn't returned to hospital after being allowed out on leave. He succeeds in stealing a police car, uniform and weapon, and begins working as a police officer. His behaviour rapidly becomes threatening...
