On the seventeenth of July, twenty- twenty, a man was captured for having murdered his wife with a single stab on her vertebrae, in the kitchen. He was immediately sent to the interrogation room and Lin Aiguo, who was a forensic investigator and psychologist, questioned him as Xiao Yin, who was Lin Aiguo’s friend, kept watch with Zhang Wei, who was both Lin Aiguo and Xiao Yin’s friend, from behind the mirror.

“What happened?” Lin Aiguo.

Wei Li, the victim’s husband and also first suspect of the murder, who was hunched over the table, leaned back in his chair and didn’t answer. Lin Aiguo tried again, “Do you like to gamble?” Wei Li stared at Lin Aiguo for a second and then gave a slight nod. Lin Aiguo walked out of the room and then came back in again, with six dice that he had borrowed from Zhang Wei’s Monopoly set. “I’ll place the bet, once we’ve played three rounds beforehand.” Wei Li stared at Lin Aiguo and gave a slight nod again.

The rules were set that if either one gets the same number on all three dice, wins and the other who gets different numbers on his dice loose.

Wei Li won all three of the first rounds.

Wei Li smiled at his success. Lin Aiguo looked upset and nervous,...