After an anonymous call, Nico disappears in front of his mother Anna. There is no trace of the kidnappers. Anna goes to the police, the case is taken over by Kathrin and her colleague Chris. Anna keeps receiving calls from a stranger. Anna constantly receives calls from a strange person who threatens her. After a long investigation full of thrills, the two detectives come to the conclusion that they are dealing with a former member of the Elbe cartel member. It comes to a ransom delivery, which has it in itself.