Doing a good deed just before Christmas Eve is a task for Hubert and Staller! They visit pensioner Hannelore Eissner, who hasn't paid her radio license fee for a year. To prevent the 85-year-old from getting into trouble, the police station has collected the missing amount for her.

However, the senior citizen can no longer enjoy the police's donation – she is sitting mummified in her armchair: the senior citizen has a broken neck! In addition, 400,000 euros that the old lady had withdrawn from her account shortly before her death have disappeared without a trace.

When Girwidz goes to pick up his mother-in-law from the train station, Santa Claus races down a hill on his sleigh and narrowly misses his car. The mother-in-law has to wait while the police superintendent takes the injured Santa Claus to the hospital.

The injured man is Georg Obermeier, who was reported missing by his wife a year ago. When Hubert arrives at the hospital with Katharina Obermeier, her husband has disappeared without a trace once again.

After work, another surprise awaits Hubert: 16-year-old Anna is standing at his front door, claiming to be his daughter...