Xiao Song took Ran Yan and Sang Chen to see the physical evidence drum car. The learned Sang Chen not only revealed the origin of the drum car, but also started the drum car. Xiao Song found that the way the stone man on the car beat was like a whisper, so he endured the headache caused by the high-frequency sound of the drum car to record the drum spectrum. The three found clues left by the killer: the four missing persons are still alive, but they need to be found within eight hours, otherwise the killer will use slaughter to kill them. Ran Yan and Xiao Song called an acquaintance of the four to investigate and found that the four carrion and the four missing persons turned out to be relatives.
Sang Chen, who was about to leave Tashishifu House, accidentally borrowed the exhibitor’s oil-paper umbrella because of the rain, leaving a note. At this time, Su Fu, who was looking for Ran Yan, sneaked into the room where Xiao Song temporarily stayed in the Assassin’s Palace to peek at the case. Xiao Song realized that there was someone in the room and pushed in, but found that the room was empty. At this time, Su Fu appeared in the courtyard under an umbrella and told Xiao Song that he would pick up Ran Yan. Seeing that Ran Yan was happily taken away by Su Fu, Xiao Song became very jealous. At the same time, he was more suspicious of Su Fu’s identity and immediately arranged Bai Yi to investigate the details.
