Luo Yao has been investigating Lao Mu all along.

Just in order not to alarm the other party, he did not use any external channels, and all of them were done by himself, so as to ensure that he would not be alarmed.

In addition to taking Gong Hui to drink coffee and eat desserts made by Lao Mu every weekend.

As long as he has time, he will try to find opportunities to observe and track Lao Mu's whereabouts, and try to understand his social range, living habits, eating habits, and so on.

There is also the information of all the waiters and kitchen personnel in Lao Mu Coffee House, those who have stayed in the past five years, those who have left the house, and those who are currently on the job are all within the scope of the investigation.

In addition, Luo Yao also asked Xu Jihong to listen to the phone of the Twilight Coffee House and the phone of his residence.

He can use almost all the means at his disposal.

"Team leader, I have a new discovery, would you like to hear about it?" On this morning, Luo Yao was eating breakfast and preparing to go to work at the fifth school, when Xu Jihong suddenly made a phone call.

"Well, see you in ten minutes."

"It's that vixen again, why does she keep calling you, she must have an intention against you?" Gong Hui was very surprised, but she couldn't do anything to Xu Jihong, she came out of the temporary training class, and Luo Yao was not her.

She regrets it now, if she had agreed in the warehouse of the Huanggang County County Military Station, then she would have justifiably driven people out at this moment!

"This is work, Xiaohui, you have to distinguish between public and private, don't always think about those useless things." After Luo Yao finished eating, he put down the dishes and chopsticks and said, "I'll leave first, you clean up." ”

"Hmph, I'm going too, listen to what she says?"

"No, you said you want to be a newspaper operator, what if my dad calls and we can't answer it?" Luo Yao shook his head.

"Then you promise me that you won't be tempted by that vixen."

"I'll give you an explanation, if you don't drive the Japanese out of China, I won't think about personal feelings, so you'd better not waste your feelings on me." Luo Yao sighed, it is better to explain some things clearly, although he is not sure what his future holds, this war is not over, he will definitely not consider personal problems.

Gong Hui was stunned.

Luo Yao said very resolutely, not like he was joking, Gong Hui could hear it, this man looked at him as gentle as jade, and in his bones it was as hard as a rock, and what he decided would never change easily.

She suddenly hated herself, such an important opportunity was wrong, if she agreed at that time, she could call herself a girlfriend, even if it was not combined, it would be different.

"You think about it, if you think that our identity is not suitable now, you can adjust it now." After Luo Yao finished speaking, he put on his coat and went out.

Ten minutes later.

Luo Yao appeared in the backyard of "Yuhetang".

Xu Jihong was already waiting there.

"Team leader, I studied the process of you tracking 'Lin Miao', and found that when you were tracking 'Lin Miao', he once made a call to the outside world through the phone in a department store, and you also called this phone number, but it was an empty number, right?"

"Yes, I also think it's strange, I don't know why, the number should not be wrong." Luo Yao nodded, he wrote all of these in the action report.

It is not unusual for Xu Jihong to see it, after all, he is also a member of the group now, and he has the right to know the past actions of the group so that he can find new clues.

After all, there are still many doubts in the case of "Kappa" Lin Miao that have not been clarified, especially since there is a "gentleman" above him who controls him, and this person has not yet been dug up.

"Well, what did you find?" Luo Yao asked.

"I also thought it was strange at first, if it wasn't for the team leader, you made a mistake, then there must be a problem in some link." Xu Jihong said, "So, I went to the telephone bureau to check again, and found that this number was indeed an empty number, and the telephone bureau had never assigned this number to anyone or organization." ”

"Go on."

"Later, I found out that the French Concession Telephone Bureau uses the most advanced automatic exchange, and there is no need for manual transfer, so I wondered if someone would take advantage of this and transfer the phone into this empty number to another number, so that we can know the number in time, and it is impossible to know who he really answers?" Xu Jihong explained.

"Can it be done technically?"

"Yes, there is such an automatic exchange in foreign countries, and it is completely possible to change the incoming number into another number through conversion through certain settings." Xu Jihong said. (The author is not an expert in telecommunications, so please forgive me for not explaining it properly)

"In other words, the number Lin Miao dialed is actually not the same number as the number he wants to call, but it can be converted between the two, does that mean?" Luo Yaodao, he also suddenly realized, isn't this an automatic transfer, a very mature technology in later generations.

It's just that now, it's amazing that someone can think of using it for covert communication.

"That's pretty much what it means, so I analyzed the line where the number was located." Xu Jihong took out a list of phone numbers and handed it to Luo Yao and said, "Although I don't know which number this call is ultimately to, it must be one of these numbers!" ”

Luo Yao nodded, the current automatic telephone exchange is not as good as the future generations, a group of switches controls dozens of phone numbers, this is fixed, so it is easy to check the phone on the same line.

And it's very easy to enumerate.

"After this empty number is transferred out, and then through a simple automatic transfer device, the phone with this empty number is transferred to a certain number above, and the phone is connected, and if someone traces it afterwards, it is just an empty number, and nothing can be found."

"Can we use this call transfer technology?" Luo Yao asked.

"Yes, but team leader, is this necessary?" Xu Jihong was slightly stunned and asked.

"Of course, since the enemy can use it, we can also use it, so if we are prepared, we can set up a few empty numbers and conversion devices like this first." Luo Yaodao.

"Okay, I'll get back and make it." Xu Jihong nodded, in terms of telecommunications technology, she was one of the best in the temporary training class, and even those instructors may not be as good as her now.

"Can you screen out which of these numbers is the real number?"

"We didn't get the device, but we can check the line, but I think that since Lin Miao has had an accident, and after such a long time, the other party should dismantle the device." Xu Jihong said.

"It's been so long, we're only checking the line now, so the opponent won't suspect it, and even if the device is removed, it will leave traces, which is also a clue." Luo Yao said, "Let the telephone bureau arrange a telephone route maintenance, you personally go to keep an eye on it, and report it as soon as there is any situation." ”

"Yes, Team Leader."

"Xu Jihong, if you can find the real phone number and determine the goal, you will have made a great achievement." Luo Yao said, "When the time comes, I will report to the bureau headquarters for you." ”

"Thank you, Team Leader." Xu Jihong showed a hint of joy on his face and smiled charmingly, "When is the team leader free, where do I have good coffee......

How dare Luo Yao take this stubble, he turned his head and left.

"The team leader likes to be gentle and pure, and if you scratch your head like this, you are destined not to get into the eyes of the team leader." Gu Yuan passed by and teased.

Xu Jihong glanced at Gu Yuan: "You know a fart, men say they don't like it, but they don't know what to think in their hearts." ”

"Anyway, I don't think you have any fun with the team leader." Gu Yuan smiled, he was also very familiar with Xu Jihong, and it was normal to demean each other.

"Then you'll have to wait and see." Xu Jihong stomped his feet, snorted and walked away.

"Then I have to thank you......" Looking at Xu Jihong's bewitching back, Gu Yuan muttered to himself.

……

If Xu Jihong can really find out the phone number that "Lin Miao" called "Mr.", it will indeed help him a lot.

Although he suspected that Lao Mu was the gentleman in the mouth of "Lin Miao", there was no evidence, and he was in the French Concession, although there was no backstage, but his relationship network was very deep.

If you want to move him, you really have to have strong evidence, Lao Mu is different from Han Liangze, one order can make him arrested, and he doesn't dare to resist anything.

Because he knows that the consequences of rebellion are even more severe.

And Lao Mu may not be.

If you start arresting people in the French Concession, you can't pass the patrol hall, and if you give notice in advance, the possibility of leaking secrets is extremely great, and the French may not agree.

Moreover, Luo Yao's direct group is not a government agency that operates publicly, and many things can only be done secretly, so his work in the French Concession is much more restricted.

If you think about it this way, "Lao Mu" also has a reason to put his base camp in the French Concession.

……

"Teacher Qin, classmate Xia Yu didn't come to school today, I want to go to her house after school to have a look, can you accompany me?" When it was almost time to get off work, Jiang Xiaoyu came to Luo Yao crisply.

"Didn't Xia Yu get sick and ask other classmates to ask for leave on her behalf?"

"She just said that she was sick, but she didn't say what the illness was, as a class teacher, I was a little uneasy, and I wanted to find out?" Jiang Xiaoyu explained.

"That's it......" Luo Yao wanted to refuse, but when he thought of Jiang Xiaoyu as a girl, the current law and order in Jiangcheng was getting more and more chaotic, and if he ran into a villain, it would be troublesome.

Besides, home visits are also a matter of being a teacher, so it is not appropriate to refuse.

Jiang Xiaoyu helped him a lot in school, even from the perspective of thanksgiving, he was not very easy to refuse Jiang Xiaoyu, so he had to agree.

"I heard that Xia Yu's father works in the government department, isn't it rude for us to rush over like this?" Luo Yao asked.

"And what do you mean?"

"Let's call first, see if Xia Yu's parents are free tonight, are they at home?" Luo Yao suggested.

"Yes, thanks to your reminder, I'm going to call." Jiang Xiaoyu blushed and ran to make a call.