In the fourth year of Chuigong, Di Renjie was appointed as the governor of Jiangnan. During an inspection in Lin'an County under his jurisdiction, he encountered a chaotic case.The old man Meng Yunde sued his son-in-law Li Dayou for killing his daughter Meng Xianglian and son Meng Yang, while Li Dayou sued his father-in-law for hiding Meng Xianglian and intending to marry someone else.It turned out that Meng Xianglian and Li Dayou returned to their parents' home in anger during an argument.After Meng Xianglian returned to her parents' home, Li Dayou's mother fell ill in anger. There was no way Li Dayou could only ask Meng Xianglian to take care of her.Li Dayou came to Meng Xianglian's house and persuaded her in every way. Meng Xianglian agreed to go back, but it was too late to wait until the next day to send her back by her younger brother Meng Yang.Because Li Dayou was worried about his mother, he rushed back that night.However, after a few days, Meng Xianglian did not come back. Li Dayou went to ask for someone again, but his father-in-law told them that they had set off long ago.The two living people disappeared out of thin air, and Li Dayou suspected that his father-in-law hid his wife and wanted to marry someone else, and Meng Yunde also suspected that Li Dayou killed his wife and son.Lin'an County Magistrate Zhou Congshan didn't know what to do, so he could only ask Di Renjie for help.