The fifth book in a series of detective novels about detective Max Wunderlich. A ninety-year-old client comes to see Max. He turns to the detective with an unexpected request, which, at first glance, has nothing to do with crime. Nevertheless, the story told by the old man seemed tempting to the detective for investigation. The beginning of the story goes back to the Second World War. After listening to the old man's story to the end, Max realizes that the information very likely concerns the life of his own grandfather. With his new assistant Catherine Berger, the detective timidly takes his first steps towards establishing the truth. It turned out that there was more than enough crime in the case he took on...