"What's the difference? Isn't the murderer the one pretending to be Aunt Wang? Lao Chen said suspiciously.

"It's dawn now, and the person pretending to be Aunt Wang will soon be exposed, but have you forgotten that the person pretending to be Aunt Wang is dead?" Xu Tian said.

Lao Chen rubbed his temples, and the successive work made Lao Chen's logical thinking unable to keep up with Xu Tian.

"Yes, the fake Aunt Wang is dead, so who is the murderer? Is it really Aunt Wang? Lao Chen asked.

"The real murderer is using Aunt Wang to hide himself, as long as the real murderer can pass this level, then it doesn't matter if Aunt Wang is true or not." Xu Tian said.

"What do you mean by that?" Lao Chen was very puzzled.

"As I told you before, I don't blame you for this mistake, it's because of your traditional morality. The murderer may be the real Aunt Wang, or someone else, but I think the murderer should be the real Aunt Wang. Xu Tian said.

"I see! The murderer is Aunt Wang, but the Aunt Wang I saw last night was fake, and when I first met Aunt Wang last night, the fake Aunt Wang acted in front of me, and after I left, the fake Aunt Wang was killed, right? Lao Chen said.

"It should be roughly this process, just now I asked you when you searched the room, and you said that it was before the forensic doctor arrived at the scene of the crime, which just gave the real murderer time to hide himself." Xu Tian said.

"Yes! In that case, whoever would search the crime scene first, right? Lao Chen said.

"So I don't blame you for this incident at all, but the traditional moral concept made you not search the bed where the fake Aunt Wang was when you searched the scene of the crime, and the real murderer should have been hiding under the bed at that time, I speculate that most of the bed is a solid wooden bed, so that you can dig out a space in the bed where people can hide." Xu Tian said.

"You're pretty much right, that bed is low, and there is only a cat under the bed." Lao Chen said.

"It's because you respect the corpse too much, so you ignored this detail, but it's okay, I believe that the murderer shouldn't have escaped from the unit door, after all, there is surveillance downstairs." Xu Tian said.

"Since this is the case, is the probability that the murderer is Aunt Wang too low? If the murderer is Aunt Wang, then where will she go after we close the team? Lao Chen felt a little puzzled.

"Except for the neighbor's house in that building, I shouldn't go anywhere else, and now the murderer should still be in the unit building, but it's hard to say whether the murderer is Aunt Wang, this matter needs to be investigated in depth, but I think the person who can do this kind of thing should be Aunt Wang, otherwise she can't deceive the security guard of the community, it can be seen from the security guard who appeared at Aunt Wang's house, the security guard should know Aunt Wang." Xu Tian said.

"That's right! There is also the motive for the killing, the murderer cannot kill a security guard without a reason, they must know each other, and this point must be investigated in depth. Rest here first! I have to go back and go door-to-door to find the murderer! Lao Chen said.

"I'll go with you! There's a lot I want to say to you. Xu Tian said.

Lao Chen didn't stop for a moment, and immediately prepared to lead the whole team to drive back to the scene of the crime.

When Xu Tian walked next to Lao Chen's car, he subconsciously stopped.

"Don't worry, it's clean now." Lao Chen said.

Xu Tian was still a little hesitant, and in the end there was no way, Lao Chen had to let Li Ming drive, and Lao Chen and Xu Tian sat in the back seat together.

"Tell me about Dr. Lin!" Lao Chen said.

"Before I do that, I want to know the cause of the fire in the office." Xu Tian asked.

"The investigation has not yet been clear, the arson case has a special team to investigate, and I will inform you if there is news." Lao Chen said.

"This matter is very serious, and Dr. Lin and Mr. Jin have already told me everything yesterday." Xu Tian said.

"Really?" Lao Chen said with a calm head.

"I should have escaped, because there was something that Mr. Jin had hidden from me before, and I received a letter from Sitong." Xu Tian said.

"Any questions?" Lao Chen asked.

"The letter was told by Sitong on the phone to open it, and it was originally placed in the office, but I don't know why, the letter was taken out by someone else and sent to Mr. Jin, but Mr. Jin did not receive the original manuscript of the letter. When I confronted Mr. Jin, I showed him the original manuscript, and Mr. Jin vehemently denied that the letter was given to me in the express. Xu Tian said.

"Teacher Jin peeked at your letter?" Lao Chen said.

"That's not the point, the most important thing is that after Mr. Jin read the fake letter, that is, during the period until Mr. Jin handed over the letter to me, someone replaced the letter with the real one." Xu Tian said.

"Is there such a thing?" Lao Chen said in surprise.

"Not only that, but there is another thing that makes me feel a little strange, this incident was also told to me by Teacher Jin later, because I have been suspecting that Teacher Jin is lying to me, so Teacher Jin told me everything."

"What's the matter?"

"In the express mail that Mr. Jin received, in addition to the fake letter, there was also an envelope telling Mr. Jin to hand over the letter to me, and Mr. Jin only told me that there were these two letters in this express mail."

"Is there something else?"

"That's right! And a black and white photo of me. ”

Hearing this, Lao Chen couldn't help but shudder.

"Black and white photos?"

"It's my posthumous portrait, the workmanship is still very fine, and it was printed from my one-inch photo."

"Did you see that black and white photo?"

"I can see it very clearly, but there is another detail that I am very concerned about, my black and white photo has a capital number 'three' on it, which makes me feel very incongruous, as if someone else has numbered the goods."

Hearing this, Lao Chen turned around and took something from behind, and Xu Tian looked at it, and it turned out to be a black and white photo.

"You're not the only one who received the photos." Lao Chen said with a calm face.

"You got it too? What's going on? Xu Tian said in surprise.

Lao Chen's black-and-white photo had a capital "four" written on it, and Xu Tian immediately checked the photo and found that it was exactly the same size as his own.

……

At this moment, a fire broke out in Lao Chen's office, but fortunately, the fire was controlled by the police on duty before it spread, and nothing else was burned except for the cheap sofa in Lao Chen's office.