Lu Lingfeng and Su Wuming discussed the case, and Su Wuming said that he would investigate Gu Louzi, Nux Vomica and other clues, although Lu Lingfeng felt that Ma Meng was unlikely to be the murderer.In a house in Chang'an City, an old woman was frightened by a huge square mask after offering incense. The mask fell down and the murderer appeared.
In the Zheng Mansion, Ma Meng used Gu Louzi and Nux Vomica to poison Zheng Shaoqing Zhengzheng, and the servants were tied up.