We ought to know by now, that “Crime Does Not Pay” but just in case we had forgotten, this one combines with “Dangerous Talk Costs Lives” to warn us of the dangers of idle chatting in wartime. An explosion at a factory causes the FBI to suspect that some fifth columnist saboteurs are up to no good, but how on earth did they know of this precious shipment? The workforce are all entirely trustworthy and adamant that they have ever said a word to anyone. These are smart cookies, these Hoover boys, and so swiftly look for what these men have in common. The café across the street, and a waitress who...