In this British comedy, two look-a-likes, an airman and a secret agent, find double trouble when they are assigned a top-secret task by their government. The airman is to impersonate the agent to confuse the Nazis while the real agent sneaks into France to investigate the new buzz bombs. Unfortunately, their orders get switched and the airman ends up in France. When he is accidentally shot back to Europe inside one of the defused bombs, the airman becomes a national hero. Meanwhile the real agent tries and tries to prove his true identity. No one listens.