One path is to find clues from Che Huating's memory - judging from the information provided by Che Huating, he must have had contact with the surname Ma, do you remember? Among all the tenants, only this surnamed Ma and Che Huating authenticated the rental agreement - it can be said that it was because of this rental agreement that Zhao Zimeng did not suspect the surname Ma.

Another path is to look for clues from the historical background of the case, among the people Cha Rengui came into contact with, who may be the murderer of Cha Rengui? The murderer is likely to have a grudge against Cha Rengui.

On the way back to No. 157, the car boss once said: "I really let my mother say it." ”

Zhao Zimeng captured this sentence in time: "What did your mother say? ”

"She said that sooner or later my father would be punished. Now it seems that my mother's words have been fulfilled. ”

An important content should be added here: On the way Zhao Zimeng sent Xiao Lao home, Xiao Lao had a very important reminder: "Judging from the modus operandi and routines of the crime, the murderer is very likely to be an orthopedic surgeon, at least a dentist."

Because only a dentist can find two teeth of the right size, and only a dentist can pull out the two tiger teeth in the mouth of the deceased, and only an orthopedic surgeon can come up with a way to smash the bones and change the height of a person.

Xiao Lao's prompt provided a path for the comrades to solve the case—a very important path.

Regarding the second question, Che Huating said: "During the period when the surname Ma rented No. 157, the first house to enter must be vacant, because the house at No. 157 is different from other people's houses, and those who want to rent a house will not rent the house at No. 157 anymore as long as they inquire among the neighbors."

Therefore, only those who can't find a house for a while, and are in a hurry to move, will reluctantly live in No. 157 for a while, they continue to find a suitable house while living, as long as they find a suitable house, they will move out, in order to facilitate the settlement of rent, they will generally live for two months - there are also less than two months, or more than two months, but the car family is charged two months of rent. ”

"When the surname Ma lived in No. 157 for the first time, I was not impressed by whether other houses were rented out, because my father often intervened in this matter, and I asked less, but the second time the surname Ma lived in No. 157, I remember very clearly that when the surname Ma lived in No. 157, the second east wing was already occupied, so the surname Ma only lived in the second west wing - he originally wanted to rent three houses together - the first time, he rented two east wings."

"There's one thing that's weird."

"What's weird?"

"I remembered, the second time, not long after the surnamed Ma moved into No. 157, another family moved out, and after that, this family only lived for half a month. One day, he suddenly told me that he was moving out - I didn't even charge him a dime in rent - because I was weak and my fake house was not very clean. ”

"What's even more strange is that after that, several people came to see the house, and two people said they wanted to rent, but somehow, they suddenly didn't come. At that time, my father had already 'run away from home', and I was in charge of renting the house alone, so I was more impressed. ”

"How long has the second East Wing been idle?"

"It's been more than a month. After the departure of the surnamed Ma, several houses were quickly rented out. ”

According to Xiao Lao's analysis, the purpose of the second entry of the surname Ma into No. 157 was to smash the bones of the connecting part of the kneecap and the leg bone to change Che Rengui's height; Knock off Che Rengui's melon seed tooth and replace two tiger teeth with dentures to completely eliminate all traces of Che Rengui.

Comparatively speaking, the second time was much simpler than the first, but no matter how simple, No. 157 could not have other residents.

Because the murderer wants to pry open the wall bricks and break the leg bones, he has to restore the wall to its original state, and the movement of rebuilding the wall is relatively large, and there can be no other residents in the courtyard.

Regarding the third question, Che Huating said: "I collected the rent, but my father received the surname Ma. I already remembered that my father had been to No. 157 several times since the couple had moved into No. 157, and at that time, I didn't think about it - in fact, I should have thought about it in this way, and with my father's temperament, he could not have thought about such a beautiful and coquettish woman. ”

"In addition to being pretty, do you think that woman is coquettish?"

"Yes, I have never seen such a beautiful woman, except for the plump body and white skin, those two pairs of eyes alone are enough to seduce the soul. The woman was also dressed stylishly and revealingly. ”

"That morning, after I broke up with my father, he finished his breakfast and probably went to number 157." Che Lao Boulevard.

"Captain Zhao, I remember, when my father disappeared, there were only the couple surnamed Ma living in No. 157. It must have been—it must have been the man surnamed Ma who used a woman as bait to hook my father's soul first, and then—the man surnamed Ma closed the gate of No. 157, and the neighbors would not hear any movement. No one will notice when he builds the wall, and we won't care about the pile of bricks that have been abandoned for many years, and if it weren't for something like this, we wouldn't even remember the pile of bricks. ”

"My brother is right, I told the workers to stack the pile of bricks in the corner, and I can't even remember it, let alone anyone else." What Boss Che said is also the truth.

This brings us to the fourth question.

In the Che family, only Che Rengui and Che Huating, father and son, and Ma and his wife have met, and now only Che Huating is left.

Regarding the accent, Che Huating described it like this: "The surname Ma speaks Mandarin - it is a standard Mandarin, so I don't know where he is from, I also talked to him about this issue, and he diverted the topic; As for the wife surnamed Ma, she never spoke in front of me, before and after, I had contact with Mr. and Mrs. Ma several times, and the woman did not say a word to me, and in front of me, she did not say a word to the surname Ma. ”

"The surname Ma speaks Mandarin, which shows that he is more educated - at least it means that he is a formally educated person, and his wife never speaks in front of the landlord, which shows that her accent is more obvious, as soon as she speaks, others will guess where she is from." Linghu Yunfei said.

"Yunfei is right, what they did was an extremely unusual thing, so they didn't want others to know their identity, based on this consideration, they had to hide their traces as much as possible."

"Maybe I have too little contact with them, you can go to the alley and ask, that woman goes to Mrs. Li's tea stove every night to fetch water, Mrs. Li is the person who has the most contact with the couple, and there is another place, you may also go to investigate."

"Where?"

"'Visitors often come'. The man surnamed Ma likes to go to the bathhouse, and on the first day he moved in, he asked me if there was a bathhouse nearby, and that night, both of them went to the 'guest house' to take a bath. ”

Zhao Zimeng finally remembered that "guests often come" also have a female guest department.

Back on the 157th, it was 12:45, and the investigation could only be carried out tomorrow morning.

The three of them and the Che Huating brothers broke up at the gate of No. 157.

Before the breakup, the car boss made a request.

"Captain Zhao, I have a request, I don't know if I should say it?"

"If there is any request, just ask for it, as long as we can do it."

"Our brothers are not going to tell our mother about this matter for the time being."

"Why?"

"If my father really ran away from home, my mother would not be too sad, but in those years, my mother's heart was broken by him; If it suddenly says that the body hidden in the brick wall is my father, I fear that she can't stand it - her heart is not very good. Although she has always resented my father, after all, they have been husband and wife for decades - my mother still has some feelings for my father. ”

"Okay, let's just not mention it in front of your mother, and as for when to say it and how to say it, you brothers will do it at your discretion."

Zhao Zimeng just closed the courtyard door, suddenly opened it, and rushed out of the courtyard door.

"Che Huating, please wait a minute."

The brothers stopped.

Zhao Zimeng, Ling Hu Yunfei and Lin Di walked over quickly.

"Captain Zhao, what's the matter?"

"Che Huating, two days ago, you promised me to go back and find the rental contract, did you find it?"

"I found it—but I didn't find it, and if I did, I would have told you about it."

"When you go back, remember it, and if you think of anything, tell us about it."

"I will. Captain Zhao, as soon as the appraisal results come out, you have to tell us in time! ”

"Don't worry! We'll let you know as soon as the results come out. Tomorrow afternoon, I invite you to come to the 157th again, we still have a lot of questions for you? ”

The next morning, after having breakfast at the police station, the comrades went directly to Aunt Li's tea stove.

Che Huating is right, the wife surnamed Ma does go to Aunt Li's tea every night to flush the water, but every time she comes to flush, it is around eight o'clock, at this time there are very few people to flush, there is no need to queue, she seems to have specially picked this time - people get together, they want to speak, and if there is no object to speak, then there is no need to speak. ”

"Won't she speak?"

"I never take the initiative to talk, I sometimes greet her, she just smiles slightly, or just nods, although she doesn't speak, but she treats people very politely, when she leaves, she has to say 'thank you'."

"'Thank you'? Is that what she says to you the most? ”

"Yes! Come to me, it's nothing more than flushing, a bottle of water for a dime, two bottles of water for two cents, pay, carry water, leave, it's as simple as that. With us, very few people say 'you', she never says 'you', only 'you'. ”