Princess Mareile and her brother have been kidnapped. Guided by Mr. Moon, Little Muck uncovers the plot of a witch, steals her miraculous running shoes and frees the captive children from the lair of the evil giant Bumbo.

Josef Brandlmeier is a true Munich original. He is a beer delivery man, a stately figure, not so young anymore and often a little grumpy. He is not married, but he harbors a secret love for the widow Therese Enzinger, who reciprocates his feelings.