I make a living solving crimes.

The telephone exchanges in the 1950s were all manual.

The way to make a phone call is to shake the handle to generate electricity, then dial the phone to the telephone exchange, tell the operator the other party's number, and connect manually.

The manual switchboard is like a dressing table, with jacks on the front. The operator wears headphones, operates with his left hand and records with his right hand.

This process is very easy to monitor, so it is impossible for Vodahan to say important information on the phone.

If he wanted to contact his superiors, he had to either use a dead mailbox or meet in person.

A dead mailbox is not a real mailbox. It may be a loose brick in a dilapidated temple, or it may be a hole in a big tree by the lake.

At the agreed time, put the letter in it and leave, and someone will come to pick it up.

Whether it's a dead mailbox or a face-to-face meeting, people have to show up.

Chang Wei left the university and two hours later got Wodahan's call records for the past six months.

His life is colorful, especially on weekends, when he makes a lot of phone calls.

Chang Wei moved his fingers downward, focusing on the evening calls.

"This is it." He drew a few marks with a pencil and handed it to Fan Tuaner.

It was a call at twelve o'clock in the night, and it happened three times in half a year.

If there is anything strange.

Each of these three calls was made three times.

No one answered the first time.

The second time the call was connected, the call was disconnected within three or four seconds.

No one answered the third time.

Fan Tuan'er thought about it for a while and said hesitantly, "Should we check the caller ID?"

You don't need to tell the operator your phone number when you call him, but if you want to check, you can find it by following the line, it just takes a little more time.

Chang Wei shook his head. "It doesn't make much sense. The other party is so cautious that he couldn't have used a private phone. I guess it was a public phone, or a hotel. His check-in information might also be fake."

Fan Tuan'er nodded slightly, looking at the call log and thinking: "The first time is a notification, I'm going to call?"

"Yes, I'm going to call. Let Vodahan prepare in advance. If this call is answered, it means that the environment at Vodahan's home is not safe."

"The second call was to confirm that someone was home?"

"That's probably it. No one answered the first time. Maybe the person wasn't home. I called again the second time. If the person answered within three seconds, that meant someone was there. Maybe they didn't say anything this time."

"Then why do you have to call it a third time?"

"What if the first two times were coincidences? The third time was to ensure safety again. Only Vodahan knew that the third call should not be answered."

After saying that, Chang Wei smiled complacently, as if he had seen through the enemy's tricks. "Three seconds can't convey much information. The other party is so cautious, he must be going to visit, so he wants to make sure that Wo Dahan is at home and his home is safe."

Fan Tuaner gave him an appreciative look, "So are you going to fish this person out now?"

"Well, let's go find the minister and give this Guo Baijun a promotion."

In the minister's office, the old man looked at the two of them with a smile, "Let him be the deputy chief designer?"

"Yes, second in command, responsible for all work."

"You want the enemy to move first?"

"The deputy chief designer has more intelligence than his current deputy director. You'd better give him a deadline. For example, he should be transferred to the northwest on a business trip the day after tomorrow. We can't give the enemy time to hesitate."

The minister thought about Chang Wei's plan and sighed, "If the problem is not found in the end, it will be a big trouble. We can't just withdraw it for no reason, right?"

Chang Wei said firmly: "There must be something wrong with him, but I need evidence to convince the Marshal and give an explanation to other scientists."

If Vodahan's approach doesn't work, he has other options.

After all, there is still the re-certification guidance as a bottom line.

If all else fails, use force. As long as you find evidence, the worst that can happen is a scolding.

The minister raised his eyebrows and saw that Chang Wei's eyes were filled with sparks like flames, which were fleeting but scorching.

"Okay, I believe you. I'll go talk to the marshal, but this person cannot be moved until we get solid evidence."

"Don't worry, leader. I know the rules."

The old man's unreserved trust gave Chang Wei more confidence.

When it comes to fishing, he is a professional.

That afternoon, the institute issued a notice that Guo Baijun became the deputy chief designer of Dongyi, working with five divisions, and would go to the northwest to inspect the base the day after tomorrow.

An undercurrent is surging.

At night, in the university's high-educated families' quarters, in a small western-style building in front of Wodahan's home, Chang Wei and the investigators waited patiently.

This is a borrowed house and the owner is on the Bureau's trusted list.

"The number has been transferred to this monitoring device." Fan Tuaner pointed to the coffee table in the living room, on which was a strange-shaped machine.

The last time Chang Wei saw this kind of machine was in a spy movie.

"Turn the ringer down to minimum."

“It’s already been adjusted.”

Chang Wei stood up and walked to the window, looked at the outside environment, closed the doors and windows, and turned off the lights.

There were also bugs in the bureau, but he didn't use them.

The eavesdropping equipment at this time was too backward and could be easily found. If the person who came was a professional agent, Vodahan's life would be in danger if he was exposed.

Across the path leading to the back door of the house is Wodahan's house, and it takes less than a minute to walk there.

He watched quietly and waited.

If you have made a promise in front of the minister, you must succeed.

The spies must be keeping an eye on the research institute all the time. Once the news of Guo Baijun's promotion gets out, they will immediately contact Wo Dahan.

Because Guo Baijun is scheduled to leave Beijing the day after tomorrow.

Chang Wei didn't give them time to think.

Time passed by minute by minute.

Chang Wei stood in front of the window without moving, frozen like a statue.

Soon after the clock in the corner struck, a slight ring rang from the monitor, the lights flickered, and the tape recorder began to turn slowly.

Fan Tuaner let out a breath.

Sure enough, the fish took the bait.

The phone kept ringing, but no one answered.

Three minutes later, the phone rang again, and after a few seconds the call was connected.

But neither side spoke, only the sound of slight breathing could be heard.

Fan Tuaner looked at his watch, counted to three silently, and the phone was suddenly hung up.

Sure enough, this phone call was just a signal.

Now, everyone is waiting for the third call.

Five minutes later, the phone rang again, but Vodahan didn't answer it until it was hung up.

The investigators got excited and prepared to go.

Wodahan came out of the house, looked around, opened the gate and went back into the house.

Half an hour later, figures were swaying on the small path in the family quarters. The vague figures were hiding in the shade of the trees, and they would stop from time to time to look around.

After confirming it was safe, he quickened his pace, pushed open the gate of the Wodahan courtyard with familiarity, and knocked gently on the door.

"What's so urgent?"

"Guo Baijun was promoted to deputy chief designer and will be going to the northwest the day after tomorrow."

"What do you want?"

"Photos, photos of the Northwest Base, and the names of the personnel in their R&D team. In addition to Dongyi's list, we also need Big Mushroom's list."

"How much are you offering?"

PS: I will make up for it. I uploaded 4 chapters at 3 o'clock last night and chapters at o'clock this morning. I wrote it too hastily and I am not very satisfied with it. I will make some adjustments!

I really don’t have any drafts saved!