In a wooden hut used as a canvassing center, members of a children's puppet-theatre group are rehearsing for a production about a journey to the Moon. The goings-on inside the hut and outside are being closely followed by amateur detective Pepik Barnabás. He, however, is the first to be under suspicion when a trunk containing puppets goes missing. The children follow him but, when they catch up with him, they discover he hasn't got it. Pepík offers to help them in their search.

Two hilarious short stories set in the milieu of apprentice youth, depicting the amorous travails of teenage boys. In the first story, "The Sorrows of the Devil's Apprentice", we see a talkative storekeeper who is constantly advising his charges on how they should behave, unaware that one of the young men has fallen in love with his daughter. Overcoming shyness is also depicted in the second of the stories, entitled "May I Beg, Helen?"