Tommi Fischer, a newly divorced copywriter is looking for a replacement mother for his son. When he falls for the emancipated costume designer Evelyn he soon finds himself in the undesired role of a stay-at-home dad.

Horst receives the monthly pension from his grandmother. The only problem is, that she is dead. As a local politician wants to congratulate the grandmother to her birthday Horst "borrows" an old lady from a hospital nearby, not recognizing that he just kidnapped actress Elfriede Ott.