This isn't so much an action film, as a series of scenarios that convey a message to the watching public that "careless talk costs lives". It started out life as a training film and you can tell by the rather clunky editing that director Thorold Dickinson was thinking on his feet as this project aimed at the military grew into a very important, and effective, counter-espionage tool. It's got quite a formidable cast of serving (or reservist) soldiers including Mervyn Johns, Jack Hawkins, Stephen Murray, Basil Sydney as well as Torin Thatcher in his typical role as the baddie; and the narrative w... read the rest.