On the day of the incident, Zhu Lu returned home at about three o'clock in the hour, as usual.

After chatting with Song Yuanzhen for a while, they went to the dining room to eat together.

In addition to the two, there are also Zhu Lu's wife Chen Jinfeng, and his eldest son Zhu Hongming, while Chen Jinfeng's maid Xiaocui serves on the side.

During the banquet, Song Yuanzhen said goodbye to Zhu Lu, indicating that he would leave Zhu's mansion early tomorrow morning.

After about half an hour, Xiao Cui took the wine back and filled it for the four of them.

Because Zhu Lu still has business to deal with tomorrow, the four of them didn't drink much, and only one cup per person.

Moreover, this wine is extremely precious, if it is not used to entertain guests, Zhu Lu is usually reluctant to drink it.

After drinking, Zhu Lu returned to the bedroom accompanied by Chen Jinfeng and Xiaocui, Zhu Hongming sneaked out of the house to the teaching workshop to be happy, while Song Yuanzhen continued to hang out in the backyard with wine, and then returned to the bedroom to rest.

It is worth noting that Song Yuanzhen was not bumped into by others during his time in the backyard, so there is no so-called alibi.

According to the analysis, Zhu Lu's time of death happened to be when Song Yuanzhen was in the backyard, and Chen Jinfeng, Xiaocui, and Zhu Hongming all had alibi, so Song Yuanzhen became the target of public criticism.

After the banquet was dismissed, Zhu Lu did not eat, indicating that the poison was most likely in the wine and food.

After the investigation of the bad people, the traces of the remnants of the crane top red were indeed found in the wine jug.

But the strange thing is that the four of them obviously drank a pot of wine, but only Zhu Lu was poisoned, which is really extremely puzzling, and the bad people have not yet found out the cause.

Lu Yanqing planned to start from here, first find out how the murderer used the poison in the wine pot to kill only Zhu Lu and leave the others unharmed.

As long as this is clarified, the scope of the murderer can be narrowed down and tracked down, and it is always much better to investigate like a headless fly.

After reading the dossier, Lu Yanqing returned it to Jin Houcheng.

"What's the clue?"

Jin Houcheng asked out loud after taking the file, but his tone was extremely indifferent, obviously he didn't expect Lu Yanqing to see anything from the file.

"I'm going to find out what kind of murder the deceased was used by the murderer."

Lu Yanqing said bluntly.

"How do you want to check?"

"What about the flask?"

"Little Liu, take the flask." Jin Houcheng beckoned to a bad person not far away.

Hearing this, Lu Yanqing couldn't help frowning, "The scene of the crime was destroyed?" ”

The scene of the crime can truthfully and objectively reflect the process and methods of the criminals committing the crime, as well as other relevant circumstances, facilitate the discovery and extraction of traces and physical evidence left over from the crime, and is conducive to the correct analysis of the case facts.

If the crime scene is destroyed, it will undoubtedly make it more difficult for the family to solve the crime.

"Don't you wash the dishes and chopsticks after dinner?"

Jin Houcheng's rhetorical question made Lu Yanqing speechless.

Although the dining room was the scene of the first crime, Zhu Lu did not die of illness at the first time.

It is normal to wash the dishes and chopsticks after eating, and it is reasonable that the scene will be destroyed.

"Boss."

At this moment, the bad guy named Xiaoliu handed over the wine jug.

Jin Houcheng motioned for Xiao Liu to hand the wine jug to Lu Yanqing, so Xiao Liu handed the wine jug to Lu Yanqing.

Lu Yanqing took the wine jug and immediately looked at it carefully.

This jug is made of silver throughout, and the shape is extremely exquisite, and it seems that the bottom of this Julu is not clean.

Lu Yanqing opened the lid of the wine jug and looked inside, and sure enough, Lu Yanqing found some clues.

Crane top red, in fact, is red gong, that is, impure sulfur trioxide.

When the sulfide encounters silver, it will form a black oxide on the surface of the silver needle, that is, silver sulfide.

And there are indeed signs of silver turning black inside this flask, but the position of the blackening is slightly strange.

The position that turned black was the bottom of the wine pot and the inner wall of the wine pot, but the inner wall of the wine pot did not turn black, but only a trace of narrow at the top and wide at the bottom, which made Lu Yanqing feel shocked.

Lu Yanqing's abnormal movement was noticed by Jin Houcheng, so he asked, "What did you find?" ”

"There's something weird in this bottle!" Lu Yanqing came back to his senses and informed.

"You mean the black mark?"

"That's right." Lu Yanqing nodded.

"We also found that the mark was a little strange, but we don't know how it was caused."

They are not vegetarians, but the traces are difficult to explain with common sense, so they investigated to no avail.

"I know how this mark was made."

Lu Yanqing suddenly spoke, a faint smile tugging at the corner of his mouth.

"Oh? Seriously? Jin Houcheng was very surprised when he heard this.

"Nature." Lu Yanqing nodded firmly.

"Then why don't you come soon?"

Jin Houcheng asked urgently, the case had been delayed for five days without any progress, and Jin Houcheng's shoulders could be described as quite stressful.

If the case is not solved within seven days, the Holy One will definitely blame him, and this is not something they can afford.

"Don't worry, I still need to confirm, please ask this little sixth brother to bring the maid named Xiaocui."

Although the bad guy named Xiaoliu was a little unhappy with Lu Yanqing's trickery, since Jin Hou Chengdu didn't say much, he had no choice but to do it.

After a short time, Xiaoliu brought Xiaocui over.

Since that day's interrogation, Xiaocui and the three have been released, after all, the three are not murderers.

If the three of them were kept in prison all the time, not only would they not be able to ask why, but they would also take care of their food, drink, and Lazar, how could a bad person do such a thankless task.

Xiao Cui stood timidly in front of Lu Yanqing, with a slightly panicked expression on her face.

Lu Yanqing took the wine jug and said straight to the point: "On the night of the crime, did you put ice in the wine you drank for Lord Zhulu?" ”

Hearing this, Xiao Cui was stunned for a moment, and then nodded again and again: "Yes, yes." ”

"Does Lord Julu have a habit of chewing ice after drinking?"

"My lord does have the habit of chewing ice after drinking, and he said that his body will be hot after drinking in summer, and chewing ice can make him more comfortable."

"Alright, you can go."

At the end of the inquiry, Xiao Cui hurriedly left.

Lu Yan nodded clearly, and things were as he expected.

"It turned out to be ice!"

After Xiaocui left, Jin Houcheng suddenly realized, so that things made sense.

"That's right." Lu Yanqing gave affirmation.

Jin Hou Cheng's voice was not small, and the bad people around him gathered around him when they heard this, and looked at Lu Yanqing and Jin Hou Cheng with a curious expression.

"Boss, did you find anything?"

One of the bad guys couldn't help but ask out loud, this case was investigated for five days but no clues were obtained, which made the bad people very impatient, and they urgently needed a clue to continue the investigation.

Jin Houcheng came back to his senses and looked at Lu Yanqing on the side, "Did you find this clue, or you should explain it to them." ”

……