 However, their adventures involving the Hedgehog in the Cage are written in the standard novel form.The Hedgehog in the Cage plays a key role in the story and its sequels in the trilogy, "Stínadla se bouří" (The Shades are Revolting) and "Tajemství velkého Vonta" (Secret of the Supreme Vont).The novel tells the story of a young apprentice locksmith Jan Tleskač, who invents a flying bicycle.