An old watchmaker died mysteriously in a secret room, leaving only a brass gear that stopped at three in the morning. His apprentice Lin Xia discovered that in the antique clock restored by his master during his lifetime, each gear was engraved with a different name and date, and these people mysteriously disappeared on the corresponding dates. As the investigation deepened, Lin Xia not only uncovered a cross-century serial crime modus operandi, but also discovered that the master's death was closely related to his lost childhood memories. Behind the sound of gears turning was a cruel game between human nature and time.
