Nurse Nora is looking forward to her first Christmas vacation in years and wants to spend it quietly and relaxed with her mother Ellen. She doesn't really mind that her brother Moritz, formerly Maike, isn't coming, as she has always felt inferior to him. But then not only Moritz turns up, Grandma Lore also changes her plans and, to make matters worse, they are joined by their widowed neighbor Rolf and his detestable son Bent, as well as their daughter Katja and grandson Fritz, due to a faulty heating system.

Fritz, Walter and Andi are caught red-handed in the event of a burglary. But are the three friends in Santa Claus costume really a wanted gang of criminals? Commissioner Bremer is supposed to find that out on Christmas Eve. While her family is already waiting at home, she has to listen to more unusual confessions than she would like. But the interrogation won't go, because your intrigued colleague is just waiting to take over the prestigious case.