When the old estate owner Konrad Corbis unexpectedly dies, he leaves his wife and three children a fortune worth millions. Shortly thereafter, his wife also passes away. Commissioner Heiko Degen becomes suspicious and orders an investigation into the cases. Soon after, the oldest son Johannes becomes the target of an assassination attempt. It becomes clear that Degen is once again dealing with a serial killer. Degen embarks on a quest for clues, uncovering the dark secrets of Konrad: corruption, fraud, abuse. There are many victims, but who wants to wipe out the Corbis family? Is it just about the inheritance, or is revenge the motive of the perpetrator? After the case of the chalk murderer, a new challenge awaits Heiko Degen.