Larry Haines, a bumbling vaudeville performer, finds his routine interrupted when he becomes inadvertently entangled in a spy caper. Karen Bentley, a British secret agent who has uncovered a crucial plot against the Allies, is being pursued by enemy agents. In a desperate bid to escape capture, she seeks refuge with Larry and convinces him to accompany her to Washington D.C. under the guise of a comedy duo act. Despite his initial reluctance and complete ignorance of the espionage world, Larry agrees, and the two set out on a cross-country journey fraught with peril and comedic misunderstandings.

Their travels are anything but smooth as the enemy agents, led by the menacing Madame Stephanie Stelmina, relentlessly pursue them. Along the way, Larry and Karen must navigate various obstacles, including run-ins with local law enforcement who are confused by the pair’s conflicting identities and invented stories. Larry's slapstick antics and Karen's quick thinking create a precarious balance that keeps them one step ahead of danger. As they grow closer through their misadventures, Larry begins to rise to the occasion, discovering bravery he never knew he had.