A male corpse is discovered in the quiet stream near Weingarten. No one seems to miss the deceased, and the team from the Friedrichshafen criminal police, led by Chief Inspector Maibach, who has recently been transferred from Ravensburg, is faced with a mystery. Who was the dead man? Why did he have to die? The crucial clue that ultimately leads the investigators to the identity of the victim raises new questions, and the results of the forensic examination initially contribute more to confusion than to clarification.