Secret Command features Pat O'Brien as a onetime foreign correspondent in the wartime employ of the FBI. Under an assumed name, O'BRIEN goes to work at a shipyard, intending to keep both eyes open for potential saboteurs. To maintain the cover, O'BRIEN is given a "wife" (Carole Landis) and two children. When O'BRIEN's brother Chester Morris shows up, he can't comprehend the charade and nearly spills the beans to the Nazi spies O'BRIEN hopes to trap. Based on the short story The Saboteurs by John and Ward Hawkins, Secret Command offers a graying but still feisty Pat O'Brien doing what he does best.