A stranger places Commissioner Ann Kathrin Klaasen a female body on the floor mat of her East Frisian family home. And she doesn't remain the only victim. The dead are an old woman who the perpetrator miserably condemned. The psychopathic killer pulls the commissioner ever deeper into his perfidious game, the rules of which she does not even know. Ann Kathrin Klaasen's team works feverishly. What is the connection between the victims? Why did they have to die and why are the victims all retired? Then Ann Kathrin's ex-husband Hero bursts in the middle of a crisis session. His new lover has not returned from jogging. Ann Kathrin has neither the time nor the desire to look around the escaped bedding to take care of her ex. But when she sees his despair, she agrees to help.
On the dike they meet a witness who not only wants to see the missing jogger the day before, but also a man in the park who has obviously followed her. When Ann Kathrin Klaasen realizes that her entire house is bugged with webcams and microphones, she feels an ominous premonition. The Commissioner is determined to come to one of the webcams because she hopes to get in touch with the killer in this way. It offers itself in exchange for the hostage. A serious mistake: even Ann Kathrin Klassen could not have foreseen that evil was already so close.