Gilles Wetter, a former prosecutor from Zurich, accepts the defense of a retired professor, who has robbed a bank in a state of mental confusion.

Since his client was recently seen at the 50-year anniversary celebration of the Glarus high school, Wetter goes to the rural canton capital to look for a motive.

In Glarus he finds evidence of an unexplained death. He follows a trail that goes far back to an incident which happened on a graduation trip and to Berlin during the time of the RAF terrorists.