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.

• Filmové studio Barrandov
• Jiří Sovák
• Vlastimil Brodský
• Dana Vávrová
• Jiří Procházka
• Lubomír Lipský
• Věra Tichánková
• Jiří Bruder
• Petr Starý