Luo Yao has been investigating Lao Mu.

It is just to avoid alarming the other party and not to use any external channels. It is all done by yourself, so as to ensure that you will not alarm the enemy.

In addition to taking Gong Hui to drink coffee and eating 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 scope, lifestyle, eating habits, etc.

There are also information about all the waiters and kitchen people in the Lao Mu Coffee House. Those who have been in the office within five years, those who have resigned and those who are currently in the office are under investigation.

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

He could almost use all the means he could use.

"Team leader, I have a new discovery. Do you want to listen?" That morning, Luo Yao was eating breakfast and preparing to go to work in the fifth school, when Xu Jihong suddenly called.

"Well, see Yuhetang in ten minutes."

"It's that vixen again. Why do she always call you? You must have intentions on you?" Gong Hui was very tempted, but she couldn't do anything to Xu Jihong. She was all from the training class. Luo Yao was not someone else.

She regretted it now. If she had agreed at the warehouse of the Huanggang County Military Station, she would have been rightful at this moment!

"This is work, Xiaohui, you must distinguish between public and private matters, and don't always think about those useless things." Luo Yao finished eating, put down the bowls and chopsticks and said, "I'll leave first, you can clean up."

"Hmph, I'm going to go too, what do you hear her say?"

"No, you said you want to be a radio operator. What if my father calls and we can't get it?" Luo Yao shook his head.

"Then you promise me, don't be moved by that vixen."

"I'll give you a brief explanation. If I don't drive the Japanese invaders out of China, I won't consider personal feelings, so it's better not to waste your feelings on me." Luo Yao sighed. It's better to explain some things clearly. Although he is not sure what he will in the future, he will never consider personal issues before the war is over.

Gong Hui was stunned.

Luo Yao said it very firmly, not like he was joking. Gong Hui could hear it. Although this man looked gentle and as hard as a rock in his bones, he would never change what he believed would not be easily changed.

She suddenly hated herself a little, and that an important opportunity would be wrong. If she agreed at that time, she could claim herself as her girlfriend. Even if she didn't marry her, it would be different.

"You think carefully. If you think our identity is not suitable now, you can still adjust it now." Luo Yao said, then 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 tracking 'Lin Miao' and found that when you were tracking 'Lin Miao', he once called the outside world through the department store phone number. You have also called this phone number, but it was an empty number, right?"

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

It is not uncommon for Xu Jihong to see it. After all, he is also a member of the group now and has the right to understand the group's past actions so that he can discover new clues.

After all, there are still many doubts in the case of "Kato" Lin Miao, especially the "Mr." who manipulated him, who has not yet been dug up.

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

"I also found it strange at first. If you weren't the team leader, you made a mistake, there must be something wrong with it." Xu Jihong said, "So, I went to the telephone office to check it again and found that this number was indeed an empty number. The telephone office has never assigned this number to anyone or organization."

"continue."

"Later I found out that the French Concession Telephone Bureau used the most advanced automatic switch and did not require manual transfer. I just guessed whether anyone would use this to transfer the phone number to another number by transferring it to another number. In this way, we know the number we entered in time, and it is impossible for us to know who the person who actually answered the phone?" Xu Jihong explained.

“Can it be done technically?”

"Yes, there are such automatic switches abroad. They can completely convert the entered number into another number through a certain setting." Xu Jihong said. (The author is not a telecommunications expert, so I may not explain it properly, please forgive me.)

"In other words, the number that Lin Miao dialed is actually not the same as the number he wants to call, but the two can be converted, that's the meaning?" Luo Yao said, and he suddenly realized that this is automatic transfer, a very mature technology in later generations.

But now, it is really amazing to use it for secret communications.

"That's about that, so I analyzed the route where this number is." 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 phone call is ultimately called, it must be one of these numbers!"

Luo Yao nodded. The current automatic telephone switch is not as good as that of later generations. A set of switches controls dozens of telephone numbers. This is fixed, so it is easy to check the phones on the same line.

And it's very easy to list.

"After this empty number is transferred out, the empty number phone is transferred to a number above through a simple automatic transfer device, and the phone will be connected. If someone tracks it down afterwards, it will be just an empty number and nothing can be found."

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

"Yes, but team leader, is this necessary?" Xu Jihong asked for a moment of stunned silence.

"Of course, since the enemy can use it, we can also use it. In this way, if you are prepared, you can set up a few such empty numbers and conversion devices first." Luo Yao said.

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

"Can these numbers be screened out which one is the real number?"

"We didn't get that device, but we could use the method of checking the wires. However, I think that since something happened to Lin Miao and so long has passed, the other party should have removed the device." Xu Jihong said.

"It's been so long since we checked the line now, so our opponents won't doubt it. And even if the device is removed, it will leave traces. This is also a clue." Luo Yao said, "Let the telephone bureau arrange a telephone route maintenance, and you can watch it yourself. If there is any situation, report it as soon as possible."

"Yes, team leader."

"Xu Jihong, if you can find the real phone number and determine the target, you will make a great contribution." Luo Yao said, "At that time, I will report to the bureau headquarters to ask for contributions."

"Thank you, team leader." Xu Jihong showed a hint of joy on his face and smiled charmingly, "When will the team leader have time? Where can I have the best coffee..."

Luo Yao didn't dare to deal with this, so he turned around and left.

"The team leader likes gentle and pure. If you are so tactful like this, you will be destined to be unable to get into the team leader's eyes." Gu Yuan passed by and teased.

Xu Jihong glanced at Gu Yuan: "You know what you don't like. A man said he didn't like it, but he actually didn't know what he thought."

"Anyway, I think you have no chance with the team leader." Gu Yuan smiled. He and Xu Jihong were also very familiar with each other, so it was normal for him to defame a few words.

"Then you just wait and see." Xu Jihong stomped his feet and walked away with a humming voice.

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

...

If Xu Jihong could really find out the phone number that "Lin Miao" called "Mr.", it would have really helped him a lot.

Although he suspected that Lao Mu was the gentleman mentioned by "Lin Miao", there was no evidence. He was in the French Concession and although he had no background, he had a deep network of relationships.

If you want to touch him, you really need to have strong evidence. Lao Mu is different from Han Liangze. He can surrender with one order and dare not resist at all.

Because he knew that the consequences of resistance were even more serious.

But Lao Mu may not be.

If you can't get through the police station in the French Concession, you will be able to get rid of the secret if you notify them in advance, and the French may not agree.

Moreover, Luo Yao's direct group is not a government agency that is open to activities, so many things can only be secretly done, so the merits in the French Concession will be much more restricted.

If you consider this, it is reasonable for "Lao Mu" to place his base in the French Concession.

...

"Teacher Qin, Xia Yu didn't come to school today. I want to go to her house after school. Can you go with me?" When it was almost time to get off work, Jiang Xiaoyu came to Luo Yao and said crisply.

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

"She just said she was sick, but she didn't say what the hell was. As the head teacher, I was a little worried and wanted to learn more about it?" Jiang Xiaoyu explained.

"That's it..." Luo Yao wanted to refuse, but when he thought of Jiang Xiaoyu, a girl, the public security in Jiangcheng is getting more and more chaotic now. If he meets a bad person, it will be troublesome.

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

Jiang Xiaoyu helped him a lot in school again. Even from the perspective of gratitude, he was not very easy to reject Jiang Xiaoyu, so he had no choice but to agree.

"I heard that Xia Yu's father works in a government department, isn't it too rude for us to go there rashly?" Luo Yao asked.

"What do you mean?"

"Come and ask first, let's see if Xia Yu's parents have time tonight and are they at home?" Luo Yao suggested.
Chapter completed!