The senior boss Karl Grimm is found dead in the vestibule of his hotel. Reason for his adult children, Heike, Walter and Pia, to start the war of inheritance. None of the three is too bad to cast suspicion on the siblings and to present themselves in the best possible light. Lena Odenthal has to overcome a wall of lies, intrigues and suspicions - and she can't even count on the official help of her colleague Mario Kopper, because he is struggling in the hotel kitchen. Due to a mix-up, daughter Pia mistakes the inspector for the new cook and quickly sends him to the kitchen before he can clear up the mix-up.
There, between potato salad and Jägerschnitzel, Mario Kopper tries to get important information about the murder case from the employees - a sweaty affair even for a hobby cook. Meanwhile, Lena Odenthal is trying to solve the mystery of why Karl Grimm fell over the banister at one o'clock in the morning while his apartment door was locked and the key was hanging in the apartment.