Hans and Anna – together they make the Hannas: A hefty couple who love to cook. They meet sisters Kim and Nicola, both anorexic and excitingly different. Opposites attract, however, and anything goes, so the Hannas each wind up having an affair without the other’s knowledge. But Kim and Nicola have a secret of their own in store.

In their first case, the new Saarbrücken police commissioners Schürk and Hölzer deal with the murder of the potential new managing director of a family company. The family appears completely hostile and the victim's father has also died under mysterious circumstances. The background to the events seems to go back to the Second World War, when the company employed forced labor.