Rix plays both England's top secret service man and a look-alike airman. The airman poses as the agent to throw off the Germans so that the real agent can investigate the new buzz bombs in France. Orders get mixed up, and the airman ends up in France and becomes a national hero when he is
launched back to England inside one of the buzz bombs that he has accidentally defused. The secret service man tries in vain to prove that he's the real agent.