Luo Hong's case can be said to be a closed-room murder, but as a famous detective said, there is no perfect crime in this world, and it was Lan Jingyi's case that allowed Lu Zheng to find clues to solve Luo Hong's closed-room murder case.

When everyone was paying attention to the flesh and blood between Lan Jingyi's right fingers, Lu Zheng noticed his left hand. There was a mark across the palm of Lan Jingyi's left hand, and the depth of the wound almost cut off the entire palm. Lu Zheng almost instinctively felt that the wound was strange. He turned his head and saw Shi Hu frowning in embarrassment, which further confirmed his opinion.

"This wound..." Shihu looked at it carefully and said, "The skin around the wound is smooth, and the wound is very deep, but the depth is almost the same. This is unreasonable..."

Lu Zheng asked, "Why?"

Shihu found a rope and put it in Lu Zheng's hand, saying, "If you were Lord Lan, and you caught the murder weapon, what would you do?"

Lu Zheng held the rope and pulled it inward with his fist.

Shihu said, "If Lord Lan did this, the wound at the base of the thumb would definitely be more serious."

"Is it possible that he didn't have time to pull the murder weapon after he caught it, and the murderer pulled it back?" Lu Zheng guessed.

Shihu shook his head: "No matter how late it was, the injuries could not be so even."

Lu Zheng tried it, and sure enough, there was no way to cause such scars except to face the murderer with the fist, but such an action looked awkward, and most people would not do it.

Shihu was puzzled, but Lu Zheng gradually came up with a bold guess. He asked Shihu: "What if the murderer was above the deceased?"

Shihu was stunned.

Lu Zheng's mind seemed to light up, and the doubts about Luo Hong's case slowly emerged in his mind. He asked Shihu a few more questions, and after getting affirmative answers, he was already 80% sure to solve Luo Hong's case.

Luo Hong was a man with extreme obsessive-compulsive disorder. His books were arranged in order of thickness, height and shortness. The maids could not even move the tables and chairs a bit when cleaning. If the murderer had tied a thin rope into a loop on the roof and slowly hung it in front of Luo Hong's desk, after Luo Hong sat down and worked at his desk, his head would naturally extend into the weapon. With the sharpness of the rope, the murderer only had to tighten it and pull it up to cut Luo Hong's neck.

Shihu said that the criminal was standing behind Luo Hong when he killed him. But if Luo Hong was bent over the desk and the murderer pulled the murder weapon from above, the same wound would have been caused. Shihu also said that there was some dust on the top of Luo Hong's head, and the room was clean. How could Luo Hong, who was so strict, let his head be covered with dust? It can only be said that the dust was stuck after his death, or in the process of his being killed.

"Impossible!" Tang Min retorted directly, "How can a living person put his head into a noose?"

Lu Zheng asked the servant beside him, "Does Lord Luo have difficulty seeing things clearly on weekdays and has to look very closely to see everything?"

The servant nodded, "That's right."

Lu Zheng nodded, and the last doubt was gone. According to the results of the autopsy, the rope used to kill people was thinner than a needle. It was night, the oil lamp was dim, and Luo Hong was nearsighted, so it was not impossible for such a thing to happen.

Lu Zheng did not answer Tang Min's question, but asked Bao Zheng who had already climbed to the roof: "Brother Bao! Have you found anything?"

"Yes!" Bao Zheng replied with full energy.

After a while, Bao Zheng put the things he found on the roof on the white cloth on the ground.

There were three things in total. The first was a few tiles. There was a thin white line on the side of one tile, and there were a few dark brown dots on the left and right of the thin line. According to Shihu, it was blood. The other tile, perhaps not a piece, because it had broken into many pieces, should have been crushed by being stepped on when under force. The second item was a petal. It is not accurate to call it a petal. This flower is called the Mist-in-the-Rice-and-Yellow-grass. It is a very precious and rare camellia. In the chilly spring of Yanjing City, it may only be found in the greenhouse of the Chengguo Mansion. On the day of the incident, the Su Yi brothers and sisters were invited to attend the banquet of the Chengguo Mansion and admired the Mist-in-the-Rice-and-Yellow-grass planted in the greenhouse with everyone.

If the first two items are not enough to explain anything, then the third item is somewhat intriguing. This third item is a pearl button. The Northern Frontier does not produce pearls, but they love this kind of jewelry very much, especially Princess Dai'er. All the buttons on her clothes are made of pearls.

Tang Min took a deep breath: "It's her!"

Lu Che had already sent people to collect the three items as evidence. Hearing Tang Min say this, he smiled and said: "Although the case was solved by my third brother, he is too young to handle the heavy responsibility. The task of reporting to His Majesty should be handed over to Lord Tang."

Tang Min was choked by his words. This man was clearly warning him not to steal the credit from Lu Zheng, but he said it in such a hypocritical tone, which made Tang Min's joy of solving the case also ruined his appetite.

"Don't worry, Lord Lu, I think I still have some integrity and I won't do such a thing as stealing other people's credit." Tang Min gritted his teeth.

Lu Che actually smiled hypocritically: "Then I will be grateful to Lord Tang for taking care of me."

Tang Min turned away and didn't want to talk to him anymore.

After the case was solved, Lu Zheng was still a little confused. In his opinion, these two cases were still a little strange, such as why Dai'er, a foreigner, knew Luo Hong's habits so well. Although he restored the process of the case, he was also very clear that Luo Hong's habits were one reason for committing the crime so perfectly. The murderer's boldness and prudence should not be underestimated. And would such a person leave something that clearly represents his identity at the scene?

Because of the complete physical evidence, Dai'er was quickly arrested, and the constable also found a piece of clothing with a button missing in her room. However, despite such clear evidence, Dai'er refused to admit it. She was a member of the Jie royal family, and the envoy and Su Yiyunge tried their best to prove that she could not have killed anyone. Therefore, before finding conclusive evidence, Dai'er could only be detained but not convicted.

The so-called conclusive evidence was the murder weapon and the scratches left by Lan Jingyi before his death.

However...

"No?!" Tang Min asked in disbelief.

The nanny who was in charge of checking Dai'er's body nodded and said, "Sir Tang, there is indeed no scratches on the princess. The princess is flawless."

"How is that possible!" Tang Min's head was sweating coldly, but he soon calmed down, "At that time, it was just a possibility, maybe she was not necessarily scratched..."

Lu Che on the side frowned deeply: "Then according to you, nanny, does the princess have any martial arts skills?"

The nanny still shook her head: "The princess has slender bones, her hands are soft and boneless, and her shoulders and back are slender, but it should be due to her dancing training. I don't see any signs that she has any martial arts skills."

This nanny was from the Xuanjia Guard. If it weren't for Princess Dai'er's special status, Emperor Yongning would never have asked her to check the princess's identity. What she said must be correct.

"But..." The nanny thought for a moment and said, "My lords, I once heard from my master that there are masters in this world who have reached the highest level of martial arts and returned to their original nature, just like ordinary people. So, I dare not be completely sure."

Although they said so, they also knew that this possibility was not very high.

After sending the nanny away, Lu Che and Tang Min looked at each other and sighed at the same time.

In the Prince of Chu's Mansion, Rong Zhen frowned after listening to his subordinates' report: "Are they sure?" "

It is said that it was Master Lu Zheng who solved the case."

Although Lu Zheng has only solved two cases, his reputation in Yanjing City is not small. It is because of this that Lu Che and Tang Min trusted him and arrested Princess Dai'er.

Rong Zhen was not so easy to believe. Although he did not have a deep relationship with this princess, he could see that she was a pampered princess of the royal family. She was proud of her beauty but arrogant and willful. Rong Zhen was always very accurate in judging people. If Dai'er was just pretending, he would be amazed by her disguise.

Nie Zhishu was puzzled and asked, "Didn't they say that they already had evidence? How could they be wrong?"

"Evidence can be forged." Rong Zhen said calmly.

"If it was forged, why would the murderer point the finger at Princess Dai'er?" Nie Zhishu asked.

"But I am more concerned about why the murderer wanted to kill Luo Hong and Lan Jingyi..." Rong Zhen lowered his head and thought, "If it was for the position of Dali Temple Chief Justice, after Lan Jingyi's death, it could be anyone. Could it be just to stir up trouble?"

"Why do you think so much, master?" Nie Zhishu said, "Since Princess Dai'er has been caught, whether she is the murderer or not, she must have clues, and we can naturally trace the cause then."

Rong Zhen shook his head: "I'm afraid that anyone who wants to think so will be disappointed. If the murderer is not Dai'er, then the next one to die will be her..."

At the same time, Tang Min and Lu Che stood in the dungeon with solemn faces. In front of them was Princess Dai'er who had turned into a corpse.

The lips were black, the eyes were wide open, the whites of the eyes were bloodshot, the nails were purple, and there were obvious blood spots on the body. She died of poisoning.

Whether it was suicide or murder, the case was once again shrouded in mystery. The most important thing was that Dale died in the prison of the Xia Dynasty.

If her death was premeditated, then the real big trouble has just begun.