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As indicated by its title, this Swedish comedy-melodrama is a loose adaptation of The Scarlet Pimpernel. Edvard Persson plays the title character, a dimwitted rube whose nephew is held captive behind the Iron Curtain. Svensson takes it upon himself to sneak into Commieland, adopting a "clever disguise" that a 4-year-old kid could see through. But fate smiles upon the foolish, and somehow Svensson emerges from the experience as a hero. Evidently the producers couldn't make up their mind what sort of movie they wanted Pimpernel Svensson to be; during one tense sequence, the characters unexpectedly burst into song!