The inventor of a device to protect guns against high temperatures is mysteriously murdered. Unfortunately, there's no real motivation for the murder, or for the investigation. Eventually it's discovered that the culprit is a Nazi, but the situation is confusingly presented, with an
unnecessary subplot involving entertainers and Nazi spies thrown in. This short film (a mere 49 minutes, which made it difficult to distribute) is a remake of the 1938 picture INVISIBLE MENACE.