Precinct Chief Sabine Kaiser's lease is terminated because the landlord needs the apartment for personal use. While searching for a new place to live, she tours a small, chic house in a residential neighborhood in Wolfratshausen with a real estate agent. While looking into the boiler room, she discovers the body of a man whom neither the agent, Tanja Kolbinger, nor the homeowner, Tobias Ackermann, can identify. When Hubert and Girwidz begin their investigation, the deceased turns out to be a "vacancy caretaker" for the Hinterholzer real estate agency. He had not only kept various houses in good condition for showings but had also occasionally lived in them without his boss's knowledge.