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The burglar Otto Klöppel has gained access to a villa. As he is packing up his valuables, he sees the body of the house owner, Dr. Hönisch, lying on the carpet. Around him are chess pieces and the overturned chess table. In a panic, he runs out of the house, drives too fast and is stopped by a patrol car and taken to the police station. For Strobel, the matter is clear: Otto Klöppel, an old acquaintance of the police, is the murderer. Adelheid does not believe this and looks around the crime scene. The body was holding a chess piece tightly in its hand - a rook! The murder took place during a game of chess. But there was no chair for someone to sit opposite...