On the way to a stag party, three young men have a car accident and crash into a river. Two bodies are recovered and entrusted to undertaker Lisa Taubenbaum. Divers try to find the third body, the car owner Mario, but the search is called off without result.
Lisa doubts the simple explanation of the causes of the accident and tries to point out inconsistencies to the investigating Stuttgart inspector Zellinger. When Mario, whom everyone believes to be dead, turns up in the flesh in Hepperlingen a few days later, everyone is convinced that he is responsible for the death of his friends...