Popular teacher Eva Rüttgers is happily engaged to Dr. Kurt Hiller. One day, she is informed that Hiller has an illegitimate 4-year old son. Without telling Hiller – whom she wants to surprise –, Eva invites little Gustav to stay with her.
But upon his arrival, everyone – including Hiller himself – mistake Gustav for Eva’s own misbegotten child. Because of the scandal and her alleged immoral behaviour, Eva might lose her job. Only when her students stage a public protest, all the misunderstandings are finally clarified.