Petrus
Susanne and Christian get to know each other during a wonderful week in summer - and fall in love. This, however, leads to conflicts: up to now, Susanne has been living with Wolfgang, a biologist. This shared life was harmonious and based on mutual trust. Wolfgang is not only resolute and in full command of social situations; he has also always been the stabilizing force in the relationship. This is precisely why Susanne now feels drawn to the unsettled, unsteady and frivolous Christian, the complete opposite of the calm, well-balanced Wolfgang. And Christian, working as a shift boss on a natural gas derrick, has become more aware of his personal and social responsibilities as a result of loving Susanne.
When a motorcyclist dies in an accident, lieutenant Kreutzer and his colleague Arnold receive the order to investigate the backgrounds of this mysterious case. Although the leads point to murder, head physician Dr. Nikolai, the driver of the car involved in the accident, maintains his innocence and even has an alibi. With a lot of arduous detail work, Kreutzer follows all leads and evidence. Both Nikolai’s colleagues and his son act suspiciously. Eventually, Kreutzer convicts the criminal who secretly used the physician’s car for his criminal dealings.