Liang Xufeng looked at the two people in front of him and felt that they were very similar, they were both lively and active.

Entering the house, Zhao Qiujin explained the situation to Doctor Lu, "Oh, no wonder you told me that you are very familiar with the queen, it turns out that you are the queen, then you have to handwrite your poetry collection for me." ”

"Oh, master, these are trivial matters, and the most important thing now is that if you can't find out who is the real murderer, I will be beheaded as your cutest apprentice!" Zhao Qiujin looked at the master who had found the wrong point, with a black line.

"Ah, that's not good, it's hard to recognize that the apprentice can't be beheaded, let's go, take the teacher to see, what kind of poison is that." As Dr. Lu spoke, he went to pack his bags.

The three of them hurried all the way to the palace.

Zhao Qiujin asked Leng Lingzhe for an autopsy, Leng Lingzhe agreed, they rushed to the place where the body was parked, and Doctor Lu checked the poisoning of Princess Cangyue, thinking that this was not the Jiuling San developed by himself, how could someone actually use his own poison pit to harm his own apprentice.

"Master, how is it? Anything new? Zhao Qiujin saw that Doctor Lu was silent, lowered his head and looked thoughtful, and asked anxiously.

"Eh, good apprentice, this poison was developed by the master, but the master doesn't know how to run into this palace, wait for the master to go back and teach those unruly guys a good lesson." Doctor Lu raised his eyebrows, and was very angry.

"What do you mean? Master, you still sell poison in private?! Zhao Qiujin was shocked again.

"This is Jiuling San, which was developed for the division a few years ago, colorless and odorless, and the poisoned person can't detect it at all, and then after a while, he begins to die of poison, and he will die in fantasy, so there is no pain, and it is not as ugly as other ordinary poisons, under normal circumstances, his face will be pale, his lips will be black, and it is not ugly." Dr. Lu proudly introduced his research and development results.

"But master, how did your poison appear here?" Zhao Qiujin was confused, and he didn't know why the poison developed by the master a few years ago would run into the palace.

"This poison generally cannot be circulated on the surface, otherwise the government will come to seize it, so the poison trading market is a black market, everyone agrees to trade at a specific time, but in order to maintain social stability, selling poison will leave a clear record of buying and selling, accurate to the year, month and day, and the names of the buyer and seller. That's the work ethic of what you do. ”

"Master, is there any mistake, what kind of professional ethics do you need to sell poison, do you bother to buy poison from the black market to use it to medicine rats, it must be to kill people!" Zhao Qiujin was very puzzled, she could only touch her gradually growing head in confusion.

"Oh, what's wrong with this, if someone hates everything, takes revenge on society or something, let him poison the whole city." Doctor Lu said as a matter of course.

"It seems that this matter has an eyebrow, let's go, find this person who bought poison, and you can catch the murderer." Doctor Lu looked at the suspicious Zhao Qiujin and Liang Xufeng, thinking that he was a young man, he didn't know the sinister nature of the rivers and lakes, and he hadn't even heard of the black market for buying poison.

Zhao Qiujin followed behind Doctor Lu and asked, "But Master, this black market must be strictly managed, how can we investigate?" ”

"Follow behind the teacher, and leave the rest to the teacher." Doctor Lu walked briskly in front, his hands behind his back, looking confident.

"Okay, master." Zhao Qiujin looked at the confident Doctor Lu and relieved his heart.

In the middle of the night, in the dead of night, Zhao Qiujin and his party quietly entered a gambling house on West Street.

"Call your big treasurer, saying that your poison saint is here." Doctor Lu stepped forward and said to the steward of their gambling house.

As soon as the steward heard the name of the poison saint, he immediately bowed ninety degrees, hurriedly invited Doctor Lu to the side room, and called the big treasurer.

Zhao Qiujin saw the person's reaction and knew that her master was not small, and his name was well-known in the rivers and lakes.

When the big shopkeeper heard the news, Zhao Qiujin saw that he was wearing a stone blue shirt, but he was dressed in a Jianghu atmosphere, with a loud voice and vigorous steps, and he seemed to know some kung fu.

"I don't know that the Poison Saint Lord is here, and I hope that my lord will forgive me!" The big shopkeeper bowed his head and spoke sincerely.

"Brother Xian doesn't have to be formal, I came here today for something important." Dr. Lu returned the favor.

"I heard that Lord Poison Saint has been retreating to the mountains and forests in recent years, and he has never asked about the rivers and lakes, there must be something big when he comes out this time, right? Though you command, the little one will be the first to look forward to you. The big shopkeeper said arrogantly.

"I'm here this time to see the latest transactions, especially the sales of Jiulingsan."

"That Jiuling San is a rare poison, our price here is extremely high, ordinary people can't afford it, you wait, I'll ask the guy to bring it." And when he spoke, he saluted and went out.

After a while, he came back with the account book, "Lord Poison Saint, this Jiuling San was only sold once a few days ago, and the dosage that this buyer asked for is not small, it seems that he is a rich master." As he spoke, he handed the ledger to Doctor Lu.

Zhao Qiujin and Liang Xufeng came over and looked at the words on it, "The buyer's surname is Feng!" "It seems that the wind in this palace is shining, and she usually sees me as a thorn in the flesh.

"Call the guy who was in charge of the account that day, and we'll ask about the situation." Doctor Lu waved his hand and ordered.

Within a few minutes, the young man rushed to salute, "The little one has seen the Poison Saint." ”

"Get up, do you still have an impression of the person who bought Jiuling San that day?"

"The small ones on the side may be a little vague, but the man bought a lot of them at once, and all the ones he took out were large silver tickets, and the small ones won't be mistaken." The young man gestured, carefully recalling the situation of the day.

"The dose that man bought could poison a few people." Zhao Qiujin asked.

"If the dose is heavy, it's about eight or nine, and if it's light, it's about ten." The young man thought carefully.

In Princess Cangyue's room that day, there were about eight or nine people who were poisoned, and this buyer was right, "Do you remember the buyer's body or something?" ”

"The man is not tall or thin, he is of moderate size, his face is slightly square, only one point is very unusual, the man's voice is sharp and thin, and it sounds like a eunuch." The young man gestured with his hand to the man's tall, short, fat and thin.

Liang Xufeng and Zhao Qiujin breathed a sigh of relief, this time the clues should all be connected.

Doctor Lu looked at Zhao Qiujin's satisfied appearance, twisted his beard happily, and instructed the young man, "Okay, you can go with us today, and I will invite you to recognize people tomorrow."

The big shopkeeper immediately nodded, "Listen to the orders of the Poison Saint, Xiao Zhang should follow the Poison Saint today, what else do you need to ask." The young man nodded hurriedly and followed behind Zhao Qiujin.

"It's okay, please keep today's events secret, don't let people know about my capital." Dr. Lu really didn't want to make a fuss.

The big shopkeeper nodded, looking at the figure of Doctor Lu and his entourage in the distance, he couldn't help but sigh, it took so many years to see the face of the famous poison saint, and there was really no regret about dying.