The leak case had just been closed when Yu Cheng came to report, indicating that Gu Zhengqi was in a hurry to expedite the air raid case.

"Please come in, Section Chief Yu!"

Soon, Yu Cheng, accompanied by laughter, strode into the office.

"Sir, I am so happy to have the opportunity to learn from you again this time. I don't know what to do. I reported to you as soon as I received the order!"

Yu Cheng has always been tactful in his dealings with people, speaking to them in a way that suits them perfectly. This is especially true when dealing with a ruthless character like Ning Zhiheng. Yu Cheng is the person in the intelligence department who has dealt with Ning Zhiheng the most, and he respects Ning Zhiheng from the bottom of his heart.

Ning Zhiheng also got up and came to Yu Cheng's side, smiling as he said, "Old Yu, I'm not your superior, no need to be so polite, just call me Zhiheng!"

Although Ning Zhiheng held a higher position than Yu Cheng, the two were not subordinate to each other, so Yu Cheng did not need to address him as "Director." However, Yu Cheng was worldly-wise and dared not address him by the name "Zhiheng." He quickly waved his hand and said, "Director, you can't be so casual about such a small matter. Don't scare me!"

After saying that, Ning Zhiheng made an exaggerated expression on his face. He was just being polite. He had given Cheng a lot of warnings and tried to intimidate him several times. Now it seemed that the effect was really good.

"Haha, whatever you say! Come, let's sit down and talk."

Ning Zhiheng sat down next to Yu Chengrang and said directly, "I heard that you were in charge of the air raid case from the beginning. So, after all this time, have you found any suspicious targets?"

Upon hearing about the air raid case, Yu Cheng placed the thick file in his hand on the table, his face immediately turning dejected. He said with a wry smile, "There's been absolutely no progress. Chief, let me explain the specific situation to you."

Afterwards, Yu Cheng recounted the details of the air raid that occurred a month ago in detail, and then continued, "Based on the situation at the scene, we judged that this was a targeted attack by the Japanese. The Japanese discovered that Yi Dong had claustrophobia, and they may even know that he had just accepted a new mission to decipher Japanese military codes, so they couldn't wait to take action against Yi Dong."

After listening to Yu Cheng's account, Ning Zhiheng thought for a moment and said, "Your analysis is correct. The reason why the Japanese used air raids to kill Yi Dong was to make us think that it was just an accident, in order to cover up the fact that there was a traitor among us and to provide cover for this traitor."

Yu Cheng quickly nodded and said, "That's exactly the point. But trying to cover it up only makes things more obvious. So the Director ordered us to conduct an internal investigation. However, we haven't been able to pinpoint the target. There are quite a few people who know that Yi Dong has claustrophobia. Every time the Japanese bombed, everyone would hide in the nearby air-raid shelters. Only Yi Dong was not there, so people would inevitably ask each other. Therefore, his colleagues and neighbors could all know about this. It's hard to determine the scope."

However, only the core members of their decryption team knew that Yi Dong had taken over the task of deciphering Japanese military codes. The team's work was highly specialized and secretive; they rarely interacted with other departments. Furthermore, the details of their code-breaking work were strictly confidential, and they were absolutely not to be disclosed to the outside world. Therefore, there was no possibility of intelligence leakage. Thus, we focused our attention on the eighteen members of the decryption team.

"A total of eighteen members?"

"Yes, including Yi Dong, there are nineteen people, making a total of one hundred and three staff members in the decryption room. However, most of them are auxiliary service personnel, such as cleaners and guards. The core members are only nineteen people, who are the best decryption experts and mathematicians in the country. These people are the key suspects."

The Director ordered that we not alert the enemy; we needed to make the Japanese and our spies believe that we genuinely believed Yi Dong's death was an accident. At the same time, we couldn't torture these experts—they were invaluable assets. If we injured them, this code-breaking work relied entirely on their intellect, and they'd shirk their duties, making the job impossible. So we've been investigating their surroundings, but despite a huge amount of investigation, we haven't found anything conclusive. That's why we're waiting for you, Director, to take over.”

Ning Zhiheng opened the case file, which contained a thick stack of investigation reports. He couldn't help but sigh; he was going to have to stay up all night tonight.

"Old Yu, look, I'm still dealing with the beginning and end of the leak case. I also need to go through all the materials you brought. I can't find any clues for the time being. Here's what we'll do: you go back first, and I'll familiarize myself with the situation. I'll call you tomorrow, and we'll go to the decryption room together and visit Yi Dong's family."

Yu Cheng also saw the pile of documents on Ning Zhiheng's desk, quickly nodded in agreement, stood up, and took his leave.

After seeing Yu Cheng off, Ning Zhiheng looked back at the room full of documents and materials, let out a long sigh, and began to deal with official business.

That night, Ning Zhiheng didn't even go home. He spent the night looking through documents and then just slept on the sofa in his office. The next morning, after getting up and quickly washing up, he called Yu Cheng and then left the Second Division to head to headquarters.

Yu Cheng was already waiting at the entrance of the headquarters. When he saw Ning Zhiheng arrive, he quickly came forward to greet him.

"Chief, the decryption room is quite a distance away. Let me show you the way."

Yu Cheng got into Ning Zhiheng's car, which quickly drove east for a distance before stopping at the entrance of a large courtyard. Only then did he get out of the car.

Yu Cheng pointed to the gate and said, "This is the decryption room. It's deliberately separated from other departments at headquarters to avoid attracting attention. It's very strictly managed and heavily guarded. No staff member here is allowed to take out a single piece of paper; otherwise, they will be court-martialed."

Ning Zhiheng looked at the gate; it was completely blank, without a single word on it.

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