Záhada hlavolamu (1993)

The Boys' Club of The Rapid Arrows discover that something is happening in the dark quarter of the Shadow District. An old churchman tells them the story of Jan Tleskac, an orphaned locksmith apprentice who was also the bell-ringer at St. James Church in the Shadows. There he also died in mysterious circumstances by falling from the belfry. The boys undertake a dangerous expedition into enemy territory. In the bell tower they find Tleskac's diary, in which the boy writes about an invention of his. He has hidden his plans in a metal puzzle called Hedgehog in a Cage. The instructions for freeing the hedgehog from the cage are detailed in the diary. But where the puzzle is located is something The Rapid Arrows have yet to discover. It's not easy: the Shadow District is ruled by the tough boy gang, the Vonts.