After the First World War, history professor Abel Cornelius wants to distance himself from his previously published political views. This could go well, were it not for the student Max Hergesell, who provokes the professor to such an extent that he has to defend and justify himself, especially as he really has no taste for the current social changes. When the professor's older children arrange a party, Max Hergesell also turns up, much to Cornelius' surprise. To make matters worse, the student gains the sympathy of Cornelius' beloved baby Lorchen, who only wants to be put to bed by Max...