11-year-old Katinka lives alone with her three siblings. Tristan, 15, Kirk, 9, Petra, 6, and the parrot Captain Good Mood in an apartment in Silverstreet. Here, they can decide entirely for themselves when to go to bed, if they feel like brushing their teeth, and there's no one telling them they have to do homework. That's how it's been ever since their mother mysteriously disappeared a year ago. But when their always absent parents start to arouse suspicion from the school principal, Mr. Moth, the four siblings devise a clever plan to avoid being discovered and sent to an orphanage: They will hire a housekeeper. When they choose the colorful Miss Nelly from Vollsmose - a male housekeeper in a skirt and high heels - the plan changes completely.
