Mutilated corpse of a young girl is found in her home. No hacking, no witnesses, everything looks like a perfect crime. The investigation is entrusted to the captain Lassalle, an experienced lone policeman broken by the recent death of his wife. Similar in nature, brutal killings continue to occur, and Lassalle is intrigued by the personality of a blind Narvik. But he has an alibi, and his infirmity seemingly protects from suspicion. Strange duel resembling a chess game begins between the two people.