The bar and entertainment lady Maria Kunz is found strangled in her apartment on Helvetiastrasse. Gaudenz Moser is seen at the crime scene as he drives away on his motorcycle. He gets into an accident and is arrested. All evidence points to him. His brother Vinzenz Moser calls Iseli, the pastor of their community in Graubünden, for help. He immediately travels to Zurich, where the case has already been solved by the police due to a confession. Pastor Iseli, blessed with a sense of criminal investigation, does not believe in Gaudenz Moser's guilt and conducts his own investigations in the Zurich scene.



