October 22, 1929: Kurt Soleder is working as a presenter at the Munich radio station, when one of his musicians is coming in late due to some sudden sickness; minutes later the man is dead. Police finds out that he died from cyanide poisoning after eating some of the marzipan potatoes he got from the girl with whom he had spent the night.

Traudl ist mit ihrem Sohn Rudi in der Stadt unterwegs und trifft dort auf ihren Schwager Adi. Karl Grandauer ermittelt in einem Mordfall: kurz vor einer Hörfunksendung ist ein Musiker tödlich zusammen gebrochen. Vermutlich Blausäurevergiftung.