Ekki slips on some spilled yoghurt at a supermarket and breaks a leg. As he cannot work for several months, he sues the supermarket for compensation. His opponents argue that he was drunk which can be proved by the excessive amount the alcohol Ekki bought there. Suddenly the branch manager gets killed and Ekki falls under suspicion of murder. Wilsberg is eager to help his friend by observing the activities at the supermarket as a temporary worker.