Captain Martin from the police's child department and his colleague Kraus are called to Znojmo to help solve a case regarding stolen toys found in the town's subterranean passages. The members of the local police department are convinced that the thieves are the well-known "customers" from the Znojmo elementary school, pupils Exner and Mandlík. Martin, however, has doubts about these culprits. These doubts grow even stronger after the local self-service shop is robbed and the local tobacco store reports that it is missing a lot of imported cigarettes. Martin questions the children, inspects both shops and searches through the underground.
| Directing | Milan Vošmik | Director |
| Directing | Drahomíra Králová | First Assistant Director |
| Writing | Ota Hofman | Story |
| Writing | Ota Hofman | Screenplay |
| Crew | Marcela Pittermannová | Dramaturgy |
| Camera | Jan Novák | Director of Photography |
| Camera | Rudolf Jokl | Camera Operator |
| Art | Vladimír Labský | Production Design |
| Art | Jiří Rulík | Set Decoration |
| Costume & Make-Up | Růžena Adamcová | Costumer |
| Costume & Make-Up | Oldřich Mach | Makeup & Hair |
| Editing | Miroslav Hájek | Editor |
| Sound | Emil Poledník | Sound |
| Production | Jaroslav Jílovec | Production Manager |
| Production | Karel Kochman | Unit Production Manager |
| Sound | Svatopluk Havelka | Original Music Composer |
| Sound | František Belfín | Conductor |
| Writing | Jan Procházka | Creative Producer |
| Production | Erich Švabík | Executive Producer |