The bomb-torn streets of postwar London are the stage for a ripping boys'-own adventure in this buoyant classic, the first of the great 'Ealing comedies'. When schoolboy dreamer Joe discovers that robbers are planning their crimes using secret codes in a children's comic, the police are unconvinced. So Joe and his friends take matters into their own hands… With the great Alistair Sim as a twitchy comic writer and against-type villain Jack Warner, it's an ageless joy, and the East London and dockland locations are a revelation.