Shortly before the celebration of his 95th birthday, Karl Wolter is murdered. Instead of ending their accidental marriage for good on the long-awaited divorce date, Killmer and Kati Biever take up the investigation. The suspects in their case are rather eccentric: the retarded day laborer with the glass eye, a senile chicken baron and Miss Blücher, a housekeeper with an icy stare and a heavy inheritance. During their investigations, Killmer and Kati soon realize that the crime must have something to do with an inglorious event deep in Monreal's past.
