Detective and mystery story about a doctor Enea Deruga, who has to answer for the murder of his ex-wife in Munich. His peculiar behavior in the courtroom, including emotional outbursts and indifference, mystifies those in attendance. As the trial unfolds, two opposing factions emerge: one seeking justice for a murder and the other defending Deruga's character. The turning point comes with the discovery of a letter from his ex-wife, Mingo Swieter, revealing a poignant secret. Deruga's ultimate confession about the letter sheds light on his complex motivations, leading to his acquittal.