A chimney sweep disguises as a Spring-heeled Jack-like figure during the Nazi occupation.
The heroic and mischievous black-clad "Springer", with a mask fashioned out of a sock and defying the curfew, is capable of performing fantastic leaps due to having couch springs attached to his shoes.
He taunts the occupying German army sentries and the Gestapo before escaping in a surrealistic, slapstick chase across the darkened city.
Trnka's postwar interpretation of Pérák as a quasi-superhero formed the basis for sporadic revivals of the character in Czech science fiction and comic book stories.
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