In Wesel, a grand estate is ablaze in the middle of the night. At first, the children are missing, but then Commissioner Karin Krafft finds them safe. The arsonist had rescued them because his attack was aimed at others. He begins a campaign of revenge along the Lower Rhine, leaving a spider as an emblem at every crime scene. Can Commissioner Gero von Aha track down the mysterious perpetrator? A cleverly constructed crime novel with regional wit and amusing characters.