The building contractor Hubert Thalmann is found stabbed to death by the young burglars Tim and Robin in his villa. The next day Tim goes to the police, the lawyer Thomas Borchert and his superior Dominique Kuster represent the youth in all subsequent instances. They believe in his innocence because he is also covering his friend Robin. During the investigation it turns out that both Thalmann's wife Vera and his brother Bernard have a motive.