In a wholesale pet store, the shopkeeper is found shot in the head. The victim's young son was in the house - but he cannot remember what happened. Chief Inspector Blum takes care of the child and makes a surprising discovery: Manuel is sleepwalking. As a possible witness, the boy is in great danger. His older brother comes under suspicion. During her investigations, Klara encounters a swamp of illegal animal trade, business blackmail and interpersonal entanglements. Not only the little boy, also Klara Blum is in danger