Legend has it that there was a resourceful detective named Li Gongming in ancient times. He served as the prefect of Jizhou, and was known as a "genius in the world."

One afternoon, a ferocious man ran to the door of the main hall of the mansion, drummed a tee, and cried out for his grievances.

When the man saw Li Gongming, he bowed and said, "Master Qingtian, the little one's name is Yang Du. For a long time, he has worked hard for the widow Li Du's family, and he has spent countless amounts of money. Not long ago, I saw that the mother-in-law of Li Du was lonely and pitiful at night, so I gave the remaining one hundred taels of silver. The mother-in-law of Li Du personally promised to marry her widowed daughter-in-law Li Du as my wife, and the Li Du family has also agreed. I didn't expect that the parents of the Li Du family would come out and be in power, and they were not allowed to say anything. The little one has worked hard for the Li Du family for a long time, but the savings have been spent, and the people and wealth are empty. I hope the old man Qingtian will make the decision for the little one."

Li Gongming immediately called the widow Li Du to court. In court, Li Du's statement was exactly what Yang Du said. Li Gongming frowned and asked Li Du's, "When did you and Yang Du meet?"

Li Du Shi said, "He has been a close friend of his young husband for many years." Li Gongming asked again, "When did your husband die?" Li Du Shi replied, "On the third day of March."

Li Gongming asked Li Du, her husband died of what disease. Li Du replied is distressed.

Li Gongming called Yang Du to the court again, and asked in front of Li Du's face, "How did you work hard and spend money on the Li family?"

Yang Du replied, "Li Du's husband's name is Li Cai, and he used to be a little friend. After he fell ill, because there was only an old mother and a weak woman in the family, I went out to invite Langzhong and get the medicine. It was all handled by me, and the medicine money did not cost him a penny."

Li Gongming sighed and said, "Such friendship is really rare! I don't know which medicines Li Cai took, do you remember?"

"Sir, I can't remember! I bought medicine for Li Cai many times, but I just did my best. I really didn't pay attention to the name of the medicine, and I hope my lord will forgive me."

Li Gongming chuckled and said, "Yang Du, this is human nature, what's the crime, you are too much!

Yang Du replied, "I remember the last time, the second day of March."

Li Gongming asked, "Which pharmacy caught the medicine?"

Yang Du replied, "Dongge Street Huichun Hall."

"Did you remember correctly?"

"I remember it clearly, the eldest master does not believe it, I'll know as soon as I send someone to ask." Yang Du replied calmly.

Li Gongming pondered for a moment, then ordered, "Although this case is not a matter of human life, injustice has a head, and debt has a master, so we must always get to the bottom of it. Well, Li Du's family will stay for the time being, and this official has something to say."

Li Gongming returned to the back hall and asked the servant to treat Li Du's family well, thinking in his heart: This case is strange, first, as Li Cai's friend, Yang Du's hard work and money are already kind and righteous. Li Du's mother promised to marry his daughter-in-law as his wife, and Li Du himself had no objection. Why did Li Du's parents come out to rule? Second, if Yang Du sincerely supports the Li family, he has no dissent, and is most important for benevolence and righteousness. Even if Li Du's family does not allow it for a while, Yang Du should not sue the official, which is obviously abnormal. Third, Yang Du kept saying that he ended up with "empty people and money", which shows that he worked hard for the Li family because he was drunk.

So what's the secret? Li Gongming thought hard: If it's adultery, Li Du's mother-in-law is at home, and Yang Du and Li Du's spring breeze is not easy for a while, let alone a long-term secret!

Just as Li Gongming was racking his brains and still struggling to make out a clue, the wife came to her and raised her hand to push open the south window. In an instant, a breeze came over, and the long sky and blue fields entered Gongming's eyes, which made people feel relaxed and happy. Li Gongming's spirit was refreshed, and a touch of thinking came to his mind: Why don't I take the opportunity to visit the Li family and let the facts open the "south window" that hinders people's hearts?

Li Gongming immediately ordered the servants to come from the servants, and ordered them one by one to understand. He dressed as a gentleman and went quietly to the Li family.

Arriving at the Li family, Li Gongming couldn't help but be secretly taken aback: The mother-in-law of Li Du, who was sitting silently on the bamboo chair, had white hair and sunken eyes, and was actually an old man who was blind in both eyes. Looking at her skinny and weak body and the sad expression on her face, Li Gongming's heart churned with emotion: The old woman is blind in both eyes, if her daughter-in-law has an adulterous relationship with Yang Du, how can she see it? If her daughter-in-law has an adultery with Yang Duguo, then Li Cai's death may not have been caused by heartache. According to this inference, this case can be said to be a case!

Therefore, Li Gongming simply called himself the "secretary" of the government office, and was appointed by the prefect to inquire about the relevant matters, and made it clear that this was because the eldest man Nian's mother-in-law was old and blind, and it was difficult to walk, so she specially took care of the door. Li Du's mother-in-law was grateful, so she voluntarily stuffed Yang Du's desire to marry her daughter-in-law into a hundred taels of silver, and she made it clear that she had allowed it, and repeatedly stated that she never asked him for it, but that he voluntarily stuffed it into him.

The truth began to emerge, and Li Gongming hurried back to the government office regardless of his fatigue. He had just sat down in the back hall and ordered the police officer who went to Huichun Hall on Dongge Street to inquire: On the second day of March, Yang Du did go to Huichun Hall and grabbed the medicine for heartache, that's right.

Hey, Yang Du, Yang Du, let you be as good as a ghost, and eventually you can't escape the sky net. Li Gongming waved his hand to let the soldiers retreat, but he was inevitably a little uneasy in his heart.

Not long after, a police officer who had gone to the Sanxian Pharmacy on Nanlu Street to check the accounts came in sweating profusely and said, "My lord, I've checked it out. The drugstore clerk said that on the second day of March, Yang Du went to the store to buy medicine, but it was just arsenic. After checking the account, the accountant in the pharmacy confirmed that Yang Du said that there were a group of mice in the house, and the cages of clothes were bitten by mice, so he specially came to buy some arsenic to exterminate the mice." After a while, the police officer who went to Li Du's maiden's house to check also came to report. Li Du's parents thought Yang Du was evil.

A smug smile flashed across Li Gongming's grim face, and he immediately ordered, "Let Li Du's family go home!" Then the messenger followed him secretly, "If there is a man waiting on the road, talk to him and arrest him immediately."

The officers followed the plan, and in less than two hours Li Du Shi and Yang Du were both arrested and brought to justice.

Li Gongming quickly rose to the hall, hurriedly passed Li Du's family, slammed the tree, and scolded sharply: "Bold adulteress, death is imminent, don't you confess quickly?"

Hearing the sound of "adulterer" was like a thunderbolt in the clear sky, which shocked Li Du's soul to fly out of the sky, his face was pale, and his whole body was shaking like a sieve. Li Gongming saw it in his eyes and in his heart, and immediately took advantage of his panic and confusion, he went straight to the point: "What about the four taels of arsenic? Where did it go?"

The governor of the Li Du Clan had been exposed, and it was hard to recover, so he cried loudly: "Damn the cheap woman, damn the cheap woman! To tell the truth, the cheap woman had an affair with Yang Du early on, and because she thought her husband was in the way, she conspired with Yang Du and decided to poison him. After my husband died, Yang Du wanted to marry me publicly, so he bought my mother-in-law's consent at a high cost. In fact, my mother-in-law is blind and old, even if she gave more money, where could she get it? In the end, it didn't fall into our own hands! But I never imagined that my parents knew that Yang Du had a bad record since he was a child, and he didn't allow me to marry him even if he broke his lips. There was no way, Yang Du decided to go to the yamen to complain."

The truth came out. Li Gongming personally led his soldiers to dig Li Cai's grave and conduct an autopsy on the spot. It was confirmed that Li Cai was indeed poisoned and died.

It took only three or four hours from the time the case was reported to the end of the twilight. The soldiers were full of praise: "Lord Li has a wonderful plan. I have never heard of it before!"

Li Gongming shook his head slightly and said, "In fact, everything can't be separated from the word'reason '. When I first tried this case, I felt that the case was suspicious. As the saying goes, if Yang Du is a good person, how could Li Du's parents not allow their daughter to marry him? Although I thought about the adultery in the hall, I also left Li Du's family behind, intending to make a plan to send a woman to bind the adulterer. But I couldn't help but feel uneasy in my heart. I didn't make up my mind until I found out that Li Du's mother-in-law was blind, so I let Li Du's family go home as bait. Yang Du had a ghost in his heart, eager to listen to the news, and afraid that Ya Qian would be discovered, so I expected him to wait at a distance. As soon as the pharmacy checked, it was inspired by Yang Du. It was the second day of March again, and it was the Huichun Hall on Dongge Street, and I knew it was clearly an arrangement. It's just that he didn't think of the truth that things must go against each other. The more poised he was, the more people suspected that there was no silver in this place.

When everyone heard this, they were amazed.