Nantian Yoko followed Liang Zhongchun to the office, and Liang Zhongchun handed her a sorted document.

"Chief Nantian, this is the evidence I searched in the flour mill in Mingtai. These messages mention the Third War Zone and a code-named "Nightinging".

"Nightingale?" Yoko Minamida looked through all the contents of the telegram. "The content on the telegram mentioned the code name of the "Nightingale" three times. From the time point of view, it was mid-January, early February and end of February, but the specific content was not mentioned."

"Chief Director Nantian, I have a bold guess that this nightingale may be hidden inside us." Liang Zhongchun said.

Section Chief Nantian suddenly looked up at him: "Reason!"

Liang Zhongchun explained: "Courselor Nantian, please recall what major events happened in late January, mid-February and early March?"

Yoko Nanda recalled a little, and a look of surprise and doubt appeared on her face!

"It seems that Section Chief Nantian should be the same as I thought." Liang Zhongchun knew that the plan had been completed when he saw her expression.

The Sakura Number incident in late January! The Consulate incident in mid-February! The Wu Mingda incident in early March!

These three incidents were all serious dereliction of duty by the Japanese and puppet spy agencies!

"If this nightingale is really related to these events, it would be terrible! There is such a military commander hidden inside us. No wonder many operations have been in trouble recently. It seems that it is not only the problem of the Special High School and the Gendarmerie, but the problem of No. 76 is even more serious!" Nanda Yoko frowned, "Director Liang, in your opinion, who is this nightingale?"

Liang Zhongchun pretended to think for a while before saying, "The three things that can be lifted from Sakura, the Consulate and Wu Mingda mean that Nightingale's status is definitely not low. Think about it, there are not many people around the Sakura No. 76 who know about this, and there are almost no ones that can be accessed. Ah, the reason why I say it almost is because the other party may not have obtained relevant information from No. 76.

The goal of the intruder in the consulate is very clear, obviously premeditated, and he is also very familiar with the architectural layout of the second floor of the consulate. It is obvious that it has been investigated in detail.

Finally, and the most important Wu Mingda incident, we searched overnight, but the underground party disappeared quietly. It was obvious that they dared to evacuate in a hurry before the search. Someone must have informed them. We blocked all the traffic roads in time and searched the people on the list, but no one noticed. How did they leave? If no one secretly helped them, I wouldn't believe it! Those who helped the underground party must be familiar with all our search operations, so that they can find the spaces that can be used to help them escape!"

After listening to Liang Zhongchun's analysis, Yoko Nanda fell into deep thought.

The Sakura Number incident was fully responsible for the Special High School. After the accident, she also focused on the investigation of the Special High School, the Gendarmerie, and relatives and friends of the new government personnel, but in the end, no useful clues were found. Now it seems that her investigation direction might be wrong at the beginning!

She had suspected Minglou and the Japanese Communists within her side, but she had never doubted anyone who was doubtful.

The other party is a senior executive of No. 76, and his favorite student. He is also a wealthy daughter with many connections in the new government and Shanghai financial circles. He has a close relationship with Minglou, and this person is Wang Manchun!

The reason why Yoko Minamida did not doubt Wang Manchun at the beginning was that he discovered and promoted the other party. It can be said that she can be regarded as her own direct line. Moreover, she is very confident in her agent abilities and believes that she will not take it by mistake. Under such dual reasons, she ignores her suspicion of Wang Manchun.

Now it seems that Wang Manchun is indeed very suspicious. She can obtain the information of Sakura through Minglou and her father Wang Fuqiu, and can even use her rights as the director of the No. 76 Intelligence Department to facilitate the underground party's special train, such as disguising as a spy.

Moreover, Wang Manchun often goes to the Extra-high School Textbook Department to report to himself, and takes the opportunity to investigate the consulate and will not arouse suspicion.

During the Wu Mingda incident, Wang Manchun took the initiative to enclose and define the hidden range. It seemed reasonable and well-founded, but fixed her and everyone's thinking in the range she enclosed, thus ignoring other places. If the underground party was just hidden outside the enclosed range, then he could take the opportunity to escape easily.

Finally, everyone on No. 76 was transferred to Jing'an Temple, which greatly reduced the number of people searched and gave underground parties an opportunity to take advantage of it!

As for the search of Jing'an Temple, there were no discoveries!

Thinking of this, Yoko Nanda's heart has changed from 100% trust in Wang Manchun to half-doubt. After all, most of them are just speculation now, and there is no evidence for everything.

Moreover, "Nightinging" is a member of the Military Control Commission. After killing Wu Mingda and destroying the list, he can rest assured. Why should he take the risk to help the underground party?

"Director Liang, these are all speculations, I need evidence."

Liang Zhongchun said: "Chief Nantian, Wang Tianfeng is still in the interrogation room. Who is this nightingale? Maybe he can ask him out of his mouth."

"If the Nightingale was really the Military Control Commission nailed to the inside line of No. 76, would he say it easily?" Yoko Nanda asked.

"I think he will. After all, he has sold the codebook escort plan. Nightingale knows that he is a traitor. The Military Control Commission is ruthless to the traitor. Zhang Jin is a good example." Liang Zhongchun nodded.

When Yoko Nanda thought that this was true, she stood up and said, "Let's go to the interrogation room to see the poisonous bees!"

The two of them came to the interrogation room underground and saw Zhuang Xiaoman guarding the door of the interrogation room where Gao Yuan was imprisoned, and Zhang Jin was next to her.

"Where is Director Wang?" asked Yoko Nanda.

"Director Wang returned to the office to check the intelligence documents found in Gaoyuan's store." Zhuang Xiaoman replied.

"She didn't meet Gao Yuan alone just now, right?"

"No, Director Wang will go back to his office after you leave. What's wrong, Chief Nantian?"

"It's okay, you're watching outside. If Director Wang comes, let her wait outside first." After Nantian Yoko finished speaking, she walked into the interrogation room where Wang Tianfeng was detained.

"Come in too." Liang Zhongchun looked at Zhang Jin.

Zhang Jin nodded: "Okay."

"How is the matter done?"

"Done."

Before entering the door, the two quickly communicated.

In the interrogation room, Yoko Nanda walked up to Wang Tianfeng and asked, "Wang Tianfeng, I have something I want to ask you. I hope you can answer honestly, which will benefit everyone."

Wang Tianfeng smiled disapprovingly: "What else can I do? I just survive. What else do you want to know? Ask."

"Have you heard of the code name Nightingale?" asked Yoko Minamida.

"Nightingale? What are you asking about this?"

"You don't need to know, answer me, know or don't know."

"I know." Wang Tianfeng nodded.

"The Nightingale is a man or a woman. Is your Military Control Commission nailed to the inside line of No. 76?"

Wang Tianfeng glanced at Nantian Yoko, then turned his gaze to Zhang Jin, and grinned: "Didn't he tell you?"

Nantian Yoko turned her head and looked at Zhang Jin. Zhang Jin quickly said, "Wang Tianfeng, it's time for you to slander me! Chief Nantian, it's the first time I heard about the code name Nightingale. I really don't know that there is this person in the Military Control Commission. Otherwise, I would have exposed him for a long time, whether it's for our cooperation or my own life!"

Wang Tianfeng suddenly laughed and said, "Hahaha! Looks like you are scared!"

Liang Zhongchun frowned and scolded: "Wang Tianfeng, honestly explain, don't use any tricks!"

Wang Tianfeng put away his laughter and said lightly: "Nightingale is not a member of the Military Control Commission, but a member of the underground party. We are actually tracing the true identity of Nightingale."

"The Nightingale is a member of the underground party!" Yoko Nanda was surprised and asked again, "So are the three things about Sakura, the Consulate and Wu Mingda related to this Nightingale?"

"It must be related. Judging from the intelligence we have collected about the underground party, Nightingale should be an important part of the underground party intelligence group. In addition to Nightingale, there is also Cobra, the highest intelligence leader of the underground party hidden in the new government! I originally hoped to find the cobra through Nightingale, but now it seems that there is no chance." Wang Tianfeng said.

"Cobra! I've heard this code name from Chief Fujita." Yoko Minamida thoughtfully, "One is in the new government and the other is in the 76th. Could it be..."

Her voice came to an abrupt end. Some things that were not proof must not be said randomly, otherwise the impact would be too great.

Zhang Jin and Liang Zhongchun looked at each other, and Yoko Nanda had successfully fallen into their trap.

Next, it should be the moment when the secret information content searched from Gaoyuan shows its power!

Zhang Jin winked, Liang Zhongchun nodded slightly, stepped forward with a crutch and said, "Chief Nantian, if she is really a nightingale, then the intelligence and evidence obtained from the underground party's high source may not be placed in her hands."

Yoko Minamida happened to think of this problem, and immediately turned around and walked out the door with a serious expression: "Go to find Wang Manchun!"

Second floor, the Office of the Director of the Intelligence Department.

"Director Wang!" Yoko Nanda pushed the door and saw Wang Manchun talking on the phone. Some paper documents were placed in a mess on the desk in front of her.

Wang Manchun was a little surprised by the sudden arrival of Nantian Yoko and others. He quickly hung up the phone and detoured from behind the desk and said, "Chief Nantian, is there anything to ask me for?"

"Who were you talking to on the phone just now?" Yoko Nanda asked.

Wang Manchun replied: "Oh, Chief Ming called me just now, and I said a few words to him."

"Minglou? Is there anything he has to do with you?" Yoko Nanda frowned slightly. Was this a coincidence or intentional?

"General Ming told me about Mingtai's affairs and asked me to investigate with confidence and boldness. If there is any need, he will definitely cooperate with me and not be burdened." Wang Manchun said.

"That's all?"

"That's all." Wang Manchun's eyes turned back and forth on the three of them, "Is there something happened?"

"Wang Manchun..."

Liang Zhongchun was about to speak when he was interrupted by Yoko Nantian. She smiled and said, "We just want to see if Director Wang has found any useful information in these underground party evidence documents?"

Although Wang Manchun was confused, he did not think deeper. Instead, he turned around and picked up a few telegrams from the table, and said, "I just read some telegrams. There was nothing special. They used code names, goods, bosses, rain, wind, etc. However, these three of them were obviously password texts. We need to know the decoding method to crack the contents."

"Password text?" Yoko Nanda took the three pieces of paper, and it was filled with nearly a whole page of content. At first glance, it was a very ordinary family letter, but how could something that could be passed through high sources be an ordinary family letter?

"I have to ask Gao Yuan." Liang Zhongchun said on the side.

"Let's go." Yoko Nanda took the letter and said, "Director Wang, please continue to check the remaining documents and don't let go of any clues."

Wang Manchun, who was about to go to the interrogation room, was stunned for a moment when he heard this, and then nodded and said, "Okay, Section Chief Nantian."

After Yoko Nanda walked out of the office, she immediately ordered Liang Zhongchun: "Let the people in the listening team monitor Wang Manchun's phone number, and I must master all the contents of her next phone number."

"I understand." Liang Zhongchun immediately raised his hand and whispered a few times.

Everyone returned to the interrogation room.

Yoko Nanda put three passwords in front of Gao Yuan and asked: "What is the way to crack this password?"

Gao Yuan looked carefully and replied: "This is a relatively advanced intelligence transmission method for the underground party. The cracking method is also very simple. It uses the flat tone format in the seven-character quatrain to insert it into the content of the article, taking the flat tone and the flat tone characters respectively, and finally connecting them together is the meaning you want to convey."

"Seven-character quatrain? Flat and tone format?" Yoko Nanda frowned and turned to look at Zhang Jin and Liang Zhongchun behind him, "Do you know how to distinguish this?"

Zhang Jin spread his hands and said, "Chief Nantian, I am just a rough man and don't understand poetry, songs and essays."

Liang Zhongchun was a little embarrassed: "I am not talented and knowledgeable, and I am ashamed."

Yoko Nanda was speechless and had to ask Gao Yuan directly: "How to crack these three passwords?"

Gao Yuanzhi said, "First look at the signature. If the surname is Li, then take the characters in the password content corresponding to the Ping Tone in the seven-character quatrain. The male name of the surname Li is Pingqi Pingxun, and the female name of the surname Li is Pingqi Zecheng. If the surname Du is Du, take the words corresponding to the Ling Tone. The male name of the Du is Zezhong, and the female name of the Du is Zezhong."
To be continued...