The poor shepherd boy Michal signs up for service at the royal castle as a gardener's apprentice. He soon learns his trade well, but he also learns the secret of Duke Rosemary's curse, which forces the three royal daughters to spend every night dancing and debauchery against their will. Everyone from the entire kingdom tries in vain to unravel the mystery of the worn-out slippers that the princesses have in their rooms every morning. So Michal sets out to fight the mystery.