A series of murders occurred in Linjiang City. The deceased was placed in a strange posture, with a "death notice" for the next victim left beside him. Cold-faced detective Shen Lie identified the murderer based on traces at the scene, but criminal psychology consultant Lin Shen pointed out that the details in the trailer were only known to the police internally, and the murderer was beside them. During the hunt, the detective and the psychologist discovered that they were the prey in the chess game.
