On New Year's Eve, the well-known mystery novelist Ye Wenxuan was found dead in his study room. His body was in a kneeling position with his forehead resting on an open hardcover book. In the margin of the book page, there is a mutilated chess board drawn in blood, with only one "handsome" chess piece. He died of poison, but the study door and windows were locked, making it a perfect secret room. What's even weirder is that the old-fashioned wall clock in the study stopped at 12 a. M. - But the forensic examination determined that the time of death was around 9 p. M.
The only suspicion at the scene was that Ye Wenxuan was holding a faded commemorative coin bearing the zodiac sign of the Year of the Horse (Year of the Horse) in his left hand. After investigation, it was found that this commemorative coin was the physical evidence of an unsolved case fifteen years ago - on New Year's Eve of that year, a boy named "Lin Mo" disappeared during the New Year's Eve fireworks, and his whereabouts are still unknown.
