Cosmo Topper, the mild-mannered bank manager who was persuaded to take a walk on the wild side by the ghosts of George and Marion Kerby in Topper, finds himself reunited with his dyspeptic wife for an extended vacation on the Riviera. But he doesn't have long to enjoy the peace and quiet before the irrepressible Kerbys materialize once again and start causing fracases, confusing the citizenry, alarming the gendarmes, getting naked, and turning every occasion into revelry or melee. Soon Marion decides that Topper as a ghost would be even more laughs than Topper in the flesh. And all she needs to arrange is one simple little murder.