A trespassing gang of boys encounter a ghost in the ruins of a castle. When they rescue the ghost who is caught in a trapset, they become allies in a fight to prevent ruins from being turned into mushroom farm by the city authorities.

The teenage Jirka (J. Procházka) likes to spend time with his aunt (Š. Ranošová) in a secluded village. He does not feel comfortable at home. His mother (J. Vaňková) and stepfather Ivan (P. Pelzer) scrape together every penny to save up for an expensive kitchen set and a Persian carpet. His mother is not very fond of his aunt and does not like Jirka's visits. On her next visit, the aunt gives Jirka her husband's carpentry tools. Jirka meets Jakub (M. Holub), an old carpenter, who helps him repair an old kitchen sideboard. Jakub shows the boy how precious wood the sideboard is made of. The two become friends. However, their mother is about to throw the sideboard away