The neighbors of Unit 3 failed to provide valuable clues, which was also expected by Chen Jie, and even Uncle Hao, who lived across the door from Mr. Ma's house, failed to provide valuable clues, let alone other people's homes. Of course, this also has something to do with the weather, one is because of the rain, and the other is because the weather is cold, and most people are too lazy to go out. The murderer chose to commit the crime at this time, and he should have considered it in advance.

The weather provided very favorable conditions for the murderer to commit the crime.

The murderer not only knows the situation of Mr. Ma's family (Mr. Ma is not at home, the two children go to school, and Mr. Liu is at home alone), but the murderer also knows the environment of the crime: first, there are only two elderly people in the Hao family at home, under normal circumstances, the old couple will not run out, and the murderer should know about this situation; Second, there is no one in the house at No. 205 (there are a total of fifteen households in this unit, each floor is three, the Hao family is No. 204, No. 205 is between No. 204 and No. 206, and No. 205 is a young couple who work in a woolen factory, and on the day of the crime, the couple happened to be on the day shift. ）； Third, the three households on the first floor are all on the normal day shift, and there is no one in the family; Fourth, next door is the big vegetable market, and the noise and noise of the big vegetable market cover up a lot of sounds, and it is impossible for Mr. Liu and his two nieces to be killed without a sound.

This basic judgment is very important. Its biggest significance is that the murderer is very familiar with the environment of Mr. Ma's house and Mr. Ma's house, in other words, Mr. Ma, Mr. Ma's family and the people in the three units are also very familiar with the murderer. This basic judgment is of great importance to the next criminal investigation work.

The murderer must have often appeared in a specific environment such as Mr. Ma's house and the third unit. If there is no problem with this basic judgment, then the comrades will certainly be able to find the trace of the murderer. If it is a spider, there must be silk, and if it is a horse, there must be traces, no matter how strong the murderer's anti-reconnaissance consciousness is, he will definitely reveal something.

At the end of the investigation, Aunt Hao said a few intriguing words (she had been silent before): "Comrade policeman, Mr. Ma's house was renovated this summer, and the family has not been moving in for a long time - just over a month!" Two days ago, Ms. Liu told me that the lights in her house were broken - my second child is an electrician, and the neighbor's lights are basically repaired by my second child, but it just so happens that he has not come for the past few days. Let's see if the lamp in Mr. Ma's house has been repaired, and if it is repaired, it will be a matter of one or two days. ”

Chen Jie was very impressed, the first thing the comrades did after walking into the scene was to open all the waits, night was about to fall, it was raining, the light in the room was very bad, in Chen Jie's memory, all the lights in Mr. Ma's house were on.

"You go and ask Mr. Ma, he must know who repaired the lamp, and this person must have been found by Mr. Ma. There is another thing that my wife doesn't know whether to say or not. ”

"It's all about this time, you don't want to hide it, human lives are at stake—let alone three lives?" Uncle Hao said.

"Auntie, say it! Say whatever you think in your heart. ”

"Mr. Ma's home decoration has cost a lot of money, at least this amount." Hao Dama raised his fingers.

"200,000?"

"Not bad. At least 200,000. ”