This spy film seems to have used every cliché from spy films made earlier in World War 2.In particular it seems to have taken much of the story line of "Let George Do It".In particular it uses the encoding of messages into music.There is the fake court martial ling of Mason,the drugging of a signals officer and a spy ring in a port,and of course the obligatory missing corpse.All done in a most lacklustre fashion.At just over 90 minutes the story drags along.Compare it with Hitchcocks " Saboteur" made the same year in Hollywood.It looks as if the film was originally longer but was cut before release.i was looking forward to seeing George Robey but his scenes as a pawnbroker were obviously cut.I think that Mason should have based his character on Formby's so he could have ended the film with a cheerful "turned out nice again".