The Xinqiao Cafe is located on the banks of the Dongjiang River, and the two of them pushed the door directly in.

They inquired with the waiter at the café and learned that Agent Wang Lin had written a letter here in the morning, asked for an envelope, put it in it, and left.

"At that time, was there another man sitting next to him and asked for an envelope?" Lang Xiaobai asked the waiter.

"Yes, he wanted one too. The man was tall and dashing, with a three-cornered mustache on his chin, a pair of tortoiseshell-rimmed glasses, and a rosewood cane with a silver-white bird's head. The waiter replied.

"You are very observant and you have a great memory, thank you very much!" Achieving their goal, Lang Xiaobai and Li Yunshan left the café.

"Clear, right? Yunshan, the man with the cane was one of the murderers. He used the most agile method to change the envelope, and when Agent Wang Lin left the café, he deliberately passed by him, and easily injected the poison into Wang Lin's body. Wang Lin only felt some slight pain, but he didn't care much and rushed to the Security Bureau. On the way, he had a drug attack and felt uncomfortable, and then he felt that he had been tricked, but he still rushed to the security bureau with great difficulty and told the secretary the surprising news. ”

Lang Xiaobai used his outstanding reasoning to make some assumptions.

"Now, the first task is to find the man with the rosewood cane."

Lang Xiaobai raised his hand to stop a taxi and told the driver to go straight to No. 34 Dongping Street. It was the address of the old man Fu Yucheng.

"Yunshan, tonight's opponent is the Murder Demon King, be cautious at the critical moment!"

Fu Yucheng lives in a very large house. They were welcomed into the door, explained their intentions to the old man Fu Yucheng, and guarded them all night.

According to common sense, the old man would be very happy when he heard this, but he said that he was not very happy: "Why bother? I have set up a trap, and if a third party appears, I am afraid that the murderer will not appear, and I will not be able to recognize his true face. ”

"But now, it's not the time to play a trap, the murderer appeared to kill your father and son. Our mission is to ensure your personal safety!"

"But, if you do it like this, won't my trap be set up in vain?"

"If you object, you'll die. Mr. Fu Yucheng, how many people are in your family?"

"In addition to me, there are my wife and sixteen-year-old son Fu Yude, and the rest are servants."

"You say you're being watched by the murderer and restless, so what about this person being a servant? Or is it an outsider? Can you tell me?"

"No, I'll tell you tomorrow."

"Why not now?"

"I don't want to say any more, I should grab the hard evidence tonight. Of course, I know who he is, but there is no evidence, and even if you are caught, he will have to be released. So, I set a trap to get the evidence. ”

"What kind of trap?"

"The walls have ears, and maybe every house has a tape recorder that is recording us, so I'm definitely not going to say it now."

"Are you saying that the murderer or his accomplices have infiltrated your house? Such as servants, cooks, merchants, etc., ......"

"I can't say for sure. I'm wary of everyone, though. ”

Bai Yan listened and felt that Fu Yucheng was really a psychopath. At this moment, a woman came downstairs in a gorgeous evening gown.

"This is my wife Xiao Xiurong."

Fu Yucheng introduced it, Lang Xiaobai felt that this woman was very young and gorgeous, and she was not compatible with Fu Yucheng.

"It's already dark, where are you going?" Fu Yucheng asked.

Xiao Xiurong showed a charming smile and said, "Why did you forget? Didn't you tell me to go to the opera and then to Lady Delu's ball?"

"Yes, yes. I told you to go. It may be because of illness that I became forgetful. Have a nice day. ”

Fu Yucheng replied very nervously, but at the end of the words, he showed thoughtfulness and gentleness.

Xiao Xiurong said goodbye to Lang Xiaobai and left.

Fu Yucheng sent his wife away with a smile in his eyes.

During this short period of time, Lang Xiaobai's eyes were not idle, and he had already seen that the emotions of this couple seemed to be intimate on the outside, and they were indeed like a couple who looked like a couple.

Fu Yucheng sent his wife away and told Lang Xiaobai: "My bedroom with my wife is on the second floor, and in order to let the gangsters take the bait, I am going to sleep on the sofa in the study next to the bedroom." ”

After speaking, he took Lang Xiaobai and Li Yunshan to the study on the second floor.

The study is richly decorated, and a safe sits in the corner next door.

Fu Yucheng pressed the electric bell and instructed the servant to bring a large plate of fruit. He invited the two to eat fruit, but the guests didn't move. He took an apple for himself, took a bite, felt too sour, and changed it to another pear. At this time, there were still three pears and four apples left on the plate, one of which was bitten by Fu Yucheng.

"Let's take a look at my son's room!" Fu Yucheng finished eating the pears in his hand, stood up, and said to the two guests.

Lang Xiaobai and Li Yunshan didn't say anything, and followed him into a very small house. The windows and doors of the house, nailed quite firmly.

"I'm well prepared, but I'm still not at ease."

Fu Yude was already asleep. Afraid of waking the child up, they crept out. Back in the study, the clock on the table was pointing to 10:15.

"Mr. Fu Yucheng, it's late, let's rest early!"

Without waiting for Fu Yucheng to answer, Lang Xiaobai continued: "Let's move the bench to the corridor and take turns waiting."

"Thank you so much. However, the other party is a very terrifying demon king. If the trap fails, my life will be lost. Hey, how can I sleep?"

"Don't worry! We'll do our best to protect you!"

"Thank you so much!"

The old man Fu Yucheng was so excited that he shed tears. Suddenly, as if he remembered something, he pulled Lang Xiaobai to the safe, and said, "There is a diary in the safe, which I have written in the past three years. My secrets are written in detail on it, and even if I am killed, a look at this diary will tell you who is the real murderer. ”

Fu Yucheng dialed the password as he spoke, took out the key, opened the iron cabinet, and took out a gray-sided diary. "All the strange phenomena and terrible things are recorded in detail, and with it, the gangsters' plots can be exposed. Mr. Lang Xiaobai, I see it clearly, this is a gray book, let's put it here first!"

After repeated instructions, the old man Fu Yucheng lay on the sofa and prepared to sleep.

Lang Xiaobai and Li Yunshan turned off the lights and walked out of the study.

At this time, the clock on the table was pointing to ten forty-five.

After looking around at all the doors and windows, thinking that there was nothing wrong, Lang Xiaobai hid in a room next to the hall and took turns waiting with Li Yunshan.

At 2:15 in the morning, Mrs. Xiao Xiurong came back by car. From then on, until dawn, there was no movement.

Lang Xiaobai thought that the important task had been completed, and with a happy mood, he woke up Li Yunshan and walked into the study together.

"Huh?" The two of them screamed.

It turned out that the old man Fu Yucheng was already lying there, with dense brown spots all over his body.

"Let's go! Go upstairs and have a look!"

Lang Xiaobai pushed open Fu Yude's door, and the situation was the same as Fu Yucheng, Fu Yude's body was full of brown spots.

The cause of death of the father and son was exactly the same as that of Wang Lin and Mosk. "How did the killer get in?"