Dr Marston (Forrest Taylor) has developed some kind of death ray apparatus that can destroy military threats at a distance. Unfortunately, in the best movie tradition, the plans for the top secret weapon are kept lying on a desk with no security. A mysterious figure in a gas mask steals the plans!
Kelly (Lloyd Hughes) from the Secret Service is called in to investigate. He is suspicious of Marston's assistant Lesserman (Jack Mulhall) and secretary Sally Flint (Sheila Bromley). However, when a test warship is destroyed despite Marston's apparatus having been destroyed it is clear there is someone else involved and with a copy of the apparatus, the hunt now is on for Marston's former assistant Walsh (John Elliot) but how is he involved with Sally Flint?
Although the film is rather shoddily made with plenty of awkward pauses and wobby sets, plus the inclusion of Fuzzy Knight and Syd Saynor to provide some dubious comedy, the film is pretty good overall. As it includes death rays, military secrets, red herrings, hidden doors and secret panels it is like a greatest hits of 1930s mystery dramas!
