This screen adaptation of the most popular Czech boys' novel and comic book narrates incidents involving two gangs of rival boys living in Prague at the end of the thirties. The Swift Arrows and the Vonts compete for who will be first to solve the secret of the Caged Hedgehog puzzle: it contains the plan of a flying bicycle. The film shines for its respectful period stylization, evocative of the atmosphere of the original illustrated work.

Cast / Martin Voldřich , Karel Zima , Jaroslav Richter , Ondřej Hošt , David Diviš , Jaromír Křížek , Martin Vlasák , Josef Dufek    Writer / Petr Kotek , Ivan Arsenjev    Story / Jaroslav Foglar    DoP / Miro Gábor    Editor / Michal Cingroš    Sound / Karel Jaroš , Ivo Špalj , Jiří Kejř    Music / Petr Malásek