In the past two days, Wu Ming has followed Wu Ming to collect the voices of 987 male workers among all 1,436 people in the factory, but less than one-fifth of them have been carried out. This made Song Hui inevitably a little frustrated.

Due to the poor clarity of the audio recording data at hand, in addition to being able to determine that the suspect was male, Song Hui could not judge the age and general appearance of the suspect from only a few words that could be distinguished, so naturally he could not narrow the scope of the suspect. That's why we have to take this stupidest and most workload-intensive approach. It is hoped that further differentiation can be made from the collected sound data, so as to narrow down the scope little by little, and finally find out the suspect from 987 people.

"Chief....... ”

"When there is no one in front of you, you still call me Wu Ming. ”

"I ...... Chief, I'm used to it. ”

"But I'm not used to it. ”

On the evening of December 30, Wu Ming and Song Hui were in the office again while sorting out the collected employee recordings, and at the same time asked Song Hui to distinguish whether there were any voices in the blurred recordings.

"Chief, tomorrow is New Year's Day. ”

"Really?"

After listening to Wu Ming's casual rhetorical question, there was no follow-up, and Song Hui asked again after a while: "Is it that all the workers in the factory are not allowed to go out?"

"yes. No one, including the factory director and secretary, is allowed to leave the factory until the missing five grams of paint and the suspect are found. I don't know if it's just to comfort Song Hui, and then Wu Ming said: "Don't worry, when things here come to an end, I promise to give you at least a month's vacation." ”

"Chief...... Song Hui raised his head and looked at Wu Ming for four or five seconds, and then said in surprise and some disbelief: "The chief has to say something." ”

"Do you have to pull the hook like a child to believe it?"

"That'...... Not necessarily. ”

Even the director and secretary of the coating factory were very polite when they saw Wu Ming, and the middle-level leaders below all saluted Wu Ming when they met, so it is not difficult to guess that the young Wu Ming must have a military rank that is not too high. Although there are inevitably doubts about this in his heart, the organizational discipline is there, and Song Hui naturally will not take the initiative to ask.

"Is there anything important to say to Song Jin?"

"Huh?" Song Hui stared at Wu Ming again and blurted out, "The chief will ...... tomorrow." ”

"I'm going to make a phone call in a moment. ”

"Yes, yes, yes. This is the first time in Song Jin's memory that she has not contacted her sister Song Jin for so long, so after saying three "yes" words in succession, she suddenly came to the end: "Just say that I miss her very much." ”

Wu Ming, who was almost amused by Song Hui's little girl's mentality, glanced at her, turned around and went out with the door. Standing in the corridor and hesitating for a while, although he knew that ordinary electromagnetic shielding could not block the quantum communication phone in his hand, Wu Ming finally walked towards the factory director's office. During the period of martial law in the whole factory, only an ordinary telephone was left in the entire coating factory that could communicate with the outside world. Then there is a red emergency phone that is in direct contact with the provincial military district. Both telephones were in the factory director's office.

Raised his hand and knocked lightly on the door, and before the people inside could react, he pushed it open and walked in.

At this time, Director Lu, who was sitting at his desk and writing something, hurriedly stood up and said, "Wu ...... Assistant, you may be seated. ”

"No, I'll use the phone. ”

"Please. With that, Director Lu was about to lift his feet and leave the office.

"No, you go on. ”

Seeing that Wu Ming was using the ordinary phone to contact the outside world, Director Lu sat back again.

"It's me. ”

"Please. ”

"Have you investigated the social relationships of those four people?"

"The general situation has been investigated and further investigation is ongoing. ”

"Let's pass on the information you already have. ”

"Good. Lin Jia on the other end of the phone casually agreed, and then asked, "Is there anything else you need?"

"Not for the time being. Wu Ming paused and said, "Oh, that's right. Song Hui said that she missed Song Jin very much. ”

"Hehe, I know, I'll tell you. ”

Since entering the Dongfeng Coating Factory, Wu Ming has never had direct contact with the three paint encapsulation personnel who are the most suspicious and have been controlled, as well as the security guard in charge of the current supervision of the production workshop, and it is Qian Jun who was the first to discover the problem. Not only the four of them, but also the other two security personnel who were on duty at the same time as Qian Jun that night, as well as all the personnel of the security office in the factory who had contact with the six people afterwards, Wu Ming did not ask about them. It is the information of the National Security Agency, which is responsible for investigating the social relations of these people.

While waiting for Lin Jia to transmit the information of relevant personnel, Wu Ming chatted with Director Lu.

"Are the staff responsible for electromagnetic shielding in the factory from the society or the army?"

"All from the retired radar and communications units of the army. ”

"Judging from the many years of experience of working here, if someone can still contact the outside world despite electromagnetic shielding, how does he do it?"

"It's just two things. Director Lu carefully analyzed: "One is that he figured out the gap time law of electromagnetic shielding equipment adjustment. The second is that he has a communication device that is different from a regular mobile phone. ”

"Could you please tell us more about the first situation. ”

The reason why he is not interested in the second situation analyzed by Director Lu is because Wu Ming knows very well that the only communication equipment in China that can be free from electromagnetic shielding interference is the quantum signal mobile phone he uses. And there are only a dozen of these mobile phones nationwide. And each mobile phone has a specific number, which is also the network access certificate of the quantum communication satellite. Without this number, even if you can imitate a quantum communication mobile phone, you will not be able to use the signal of the national quantum satellite, and the mobile phone can only be a waste.

"Although the factory has prepared two sets of electromagnetic shielding equipment, under normal circumstances, one is running and the other is standby. However, in order to prevent the standby equipment from being completely repaired and maintained, and the sudden failure of the operating equipment, the factory has formulated a set of rules and regulations for temporary maintenance and random shutdown from time to time.

However, very few people are aware of the existence of this rule. It was limited to seven operators in the workstation, two maintenance personnel, the chief of security, me and the secretary, a total of twelve people. ”

"Since it was a random shutdown, why did Director Lu just say that the suspect may have figured out the time pattern of the adjustment of the electromagnetic shielding equipment?"

"The rules and regulations we formulated clearly stipulate that the machine should be shut down immediately, but the two maintenance workers have developed the habit of basically stopping the machine for maintenance between 9 and 10 a.m. in the course of their work all year round. This is also what we found out through investigation after the incident. ”

"What is the typical downtime for repairs?"

"No more than fifteen minutes. Even in exceptional cases, it will not take more than half an hour. ”

"Did the two maintenance workers reveal why they used to shut down for maintenance between 9 and 10 o'clock?"

Their explanation was to take into account that almost all the employees in the factory were on the job during this time period. And the factory has very strict regulations, no one is allowed to carry communication equipment during work. Therefore, the two maintenance workers felt that this time period was relatively safer. ”

"Under normal circumstances, there is no communication signal in the factory, which means that it is useless for workers to carry communication equipment. In the past two days, I have carefully understood that the living area and the production area are completely separated. Except on weekends, no one is allowed to stay in the living quarters during working hours without an excuse, is that right?"

"That's right. ”

"What is the reason to return to the living quarters during normal working hours, or to stay in the living quarters?"

"Injury, illness, or other unexpected circumstances. ”

"What exactly are the emergencies?"

"This rarely happens. For example, employees forget to turn off the power of water heaters or other household appliances before leaving the dormitory to work, and they are worried about causing a fire. ”

"When this happens, did the employee go back alone, or was he accompanied by someone else?"

"If you want to return to your living quarters during working hours, you must be accompanied by a member of the security service, and there must be no less than two accompanying persons. ”

"Has the factory investigated this situation after the incident?"

"Investigated. However, there is no record of anyone returning to their living quarters during working hours. ”