Ruri Nishikujo returned directly to the Tokyo Metropolitan Police Department.

At this time, it was already past the end of work, but when there was such a big case, it was natural that all the overtime was not discussed. The people of the Nishikujo Group are also very conscious, none of them ran, all of them stayed in the big office, but they really can't find any clues in this case - the people who should be asked have been asked, the information that should be checked has almost been memorized, and the monitoring that should be retrieved has been read dozens of times, and the scene that can be found is three feet away from digging into the ground, and everyone doesn't know what to do next for a while, so they can only discuss there or pretend that they have something to do at hand.

Nishikujo Ruri entered the door and glanced at the subordinates who were demoralized, and didn't say anything, but went back to his small office with a cold face, ready to put all the information aside.

Every failure is a brick for success, and since she doesn't want to admit defeat, she can only endure failure after failure.

She casually threw her trench coat onto the office chair, rubbed her hands and sat down directly, tapping the keyboard casually, but when the screen lit up, she was suddenly stunned.

In the center of the computer screen is a black-and-white flat map with a red cross in the center and a line that reads "Here they are."

Nishikujo Ruri didn't wait to carefully distinguish the map and shouted, "Kitagawa!"

"What's the matter?" Kitagawa Jiro trotted into Nishikujo Ruri's office, with anticipation in his eyes - I haven't been with my wife for a long time, can I leave work early today?

Ruri Nishikujo looked at him and asked, "Has anyone ever come into my office?"

Kitagawa Jiro shook his head and said, "No, I've been outside...... Any questions?"

Ruri Nishikujo took a deep breath and ordered, "Call someone from the science department to come over, my computer has been hacked." ”

Kitagawa Jiro was startled and turned around and went out to make a phone call, while Ruri Nishikujo looked at the map on the screen and was stunned - did they mean the kidnappers? Or were they pranks? But if it was true, then who provided the map? Why did he provide it? What is his relationship with the kidnapper?

After being stunned for a moment, Ruri Nishikujo left the enveloping range of the computer camera, stood aside and felt uneasy, and even had the urge to pray!

It's better not to be a hoax by unscrupulous hackers, it's better to be true!

She gritted her teeth in anticipation - if it was some hacker's prank, she would have taught him a lesson he'll never forget!

Soon the professional technicians arrived, and Nishikujo Ruri said a little anxiously: "Find the person who left the picture here, quickly!"

Several technicians got busy, and Nishikujo Ruri watched them on the side and didn't respond after a long time of checking them, and couldn't help but feel irritable in his heart again, licking his lips and only feeling very thirsty.

Shirakawa Jiro also has a heavy face, the computer is hacked, and the theft of case data is big, in case of a big storm, the Nishikujo Group will be affected in the future.

Nishikujo Ruri waited for a long time, watched the technicians keep talking to each other, and kept calling to check, and finally asked in a cold voice, "Isn't there any result yet?"

Shirakawa Jiro couldn't help but ask, "Is there anything missing?"

One of the technicians raised his head, also with a puzzled expression: "The police department, Beichuan seniors, the computer is normal, there is no trace of invasion, and there is no suspicious operation record...... And according to the internal coding of the picture, this picture was drawn on this computer, and it was not copied and transmitted from the outside!"

"Isn't it possible to change the internal coding of the picture?"

"Of course, but making that kind of modification will definitely be recorded by the system operation log, and changing the system operation log will definitely attract our attention, and it is impossible to do it silently. ”

The Tokyo Metropolitan Police Department is a modern, professional and well-managed organization, and network security will naturally be a top priority - semi-closed network, controlled ports, multi-factor authentication keys, comprehensive network filtering detection, 24-hour electronic security by a professional team, any small abnormal operation on the internal network will be noticed, and the log files of the moving system are very suspicious behaviors, and it is impossible not to be discovered!

Nishikujo glazed sword eyebrows stood up, and asked in a cold voice, "This is your test result?"

"Are you sure no one has ever come into your office?" the technician was also helpless, no matter how he looked at it, it was normal, but the layman often made oolongs, and he couldn't help but start thinking about it.

Nishikujo Ruri's gaze turned to Kitagawa Jiro, and Kitagawa Jiro affirmed, "I'm not the only one outside, and if someone enters, it will definitely be discovered." ”

Ruri Nishikujo nodded silently, entering her office in her absence was a strange thing in itself, and it was impossible not to attract attention. She glanced at the map again and said coldly, "With such a complicated map, how long will it take for someone to draw here?"

The technician was silent for a while, unable to explain, so he could only apologize: "I'm sorry, police department, we didn't find a problem...... We immediately took the computer back for a detailed inspection and a full network inspection. ”

Nishikujo Ruri endured and said, "Be quick, I want to know the result immediately...... Pictures left for me. ”

"Yes!" The technician agreed, looked at Nishikujo Ruri, and saw that she didn't dare to speak with an impatient face, and turned to Kitagawa Jiro and said, "Kitagawa senior, can I borrow your mobile phone?"

Kitagawa Jiro inexplicably gave him the phone, and he took several pictures of it in front of the screen - the picture looked fine under a rough inspection, but it was better not to leave the copy in the hands of a layman when the source was unknown.

The technician returned the phone to Jiro Kitagawa, bowed, and walked away with his colleague holding Ruri Nishikujo's computer host.

Kitagawa Jiro was a little speechless, swiped the picture on his phone and looked at it, and said strangely: "It looks familiar......

Nishikujo Ruri also carefully discerned the picture and said, "Sakura Bridge to the east, the ...... on the west side of Upper East University. In the middle of the highway? The black line is the highway, and the thin line is the pipe below?" she doesn't know architecture, and she looks like she struggles with this kind of thing that resembles a building plan.

Kitagawa Jiro was slightly disappointed and said, "It can't be in the sewers, where we searched." ”

They had worked hard during this time, and since the kidnappers had come and gone without a trace, all the ways they could have taken into account had been considered, and it was naturally impossible for such an obvious target as the sewers to be ignored.

With a few incidents as the center, they sent special personnel to search the sewers more than once, including the places shown on the map, and found nothing.

Nishikujo Ruri gently pinched her chin and said slowly, "It's not a sewer, what other place can it be? Someone can't stand in the middle of the road, right?" Wait...... There's a place in the underground that we haven't searched yet!"

"Where?"

Nishikujo Ruri touched the internal phone and said, "Kazuno, pick up the sewer bureau for me!"

On the other end of the phone, Orange Heart and Nai were secretly nibbling on an apple, startled by the ringing of the phone, and it was such an inexplicable thing to pick up, desperately choked his neck and swallowed the apple pieces, and hurriedly said: "Sewer Bureau?

Ruri Nishikujo dropped the phone and silently folded her arms in contemplation - she had neglected the sewer problem before!

In the sixties of the last century, Dongying industry entered a period of rapid development, but suffered a lot because of the sewer system. Dongying is a coastal country, often frequented by typhoons and torrential rains, once the typhoon season, the roads are flooded with Jinshan, the subway station has drowned, and a large amount of domestic sewage and industrial wastewater are directly discharged into the river without treatment, and people have caused a large number of Minamata disease, bone pain, and newborn baby deformities after eating contaminated fish, and water pollution has suddenly become a topic of public concern.

Therefore, in the 70s, Toei convened the National Council of Public Pollution, established the "Sewerage Law", clarified the standards for sewer construction, and began to invest a large amount of national budget in sewer construction every year.

In order to cope with the 12 million resident population and the threat of typhoons, Tokyo directly built a new sewer system - built to the standard of a rainstorm once in five to ten years, the maximum drainage pipe diameter is 12 meters, can carry five or six buses in parallel, and the sewage shaft looks like a giant missile silos.

In order to maintain this huge drainage and sewage system, a professional management agency has been set up, the Sewer Bureau, which has more than 1,000 maintenance personnel in and out every day, and because of the strict legislation - any household garbage that does not dissolve in water is not allowed to enter the sewer, not even the oil from kitchen cooking - the sewer has been well maintained in some parts of the sewer, and has even become a tourist attraction.

There are not only maintenance personnel, but also tourists, homeless people, and some rebellious teenagers and the like.

In short, it's not a rare place, and it's not a good choice to hide after committing a crime - someone wants to hide there, and before the police can find them, the Sewers Department employees will find them first.

However, Tokyo has a history – the original name Edo began to be built during the Tokugawa shogunate. So, where did the sewers go before the construction of the new sewer system?

Is it completely covered?

Nishikujo Ruri was contemplating and thinking, as if he saw that the fog was slowly dissipating, and suddenly the phone rang. She grabbed it and said unceremoniously: "I'm the Nishikujo Police Department of the Tokyo Metropolitan Police Department, and I need sewer drawings from before 1970 within the Upper East Ward of Tokyo!"

Orange Heart and Nai had already briefly communicated with the Sewer Bureau, but the other party was still a little confused by the question, and said, "Hello, Nishikujo Police Department...... Pre-1970 Upper East Side sewer drawings? Which one do you want?"

"Which one?"

"Hey, Tokyo has been expanding for hundreds of years, and the sewers have been rebuilt with it, and there are nearly ten sewer drawings from all dynasties before 1970, can you confirm the date?"

"No need, I want them all!"

"Some are in museums...... Forget it, I'll ask someone to prepare a copy for you, when do you need to ......" The official of the Sewers Bureau hadn't finished speaking, but he heard that the phone had hung up.

He was a little angry, and he was so begging for someone to do something?

Nishikujo Ruri put down the phone, and Kitagawa Jiro admonished, "Kumitou, do you really want to believe this map?

If it's a prank, and you really believe it on your side, it will become a scandal.

Nishikujo Ruri looked at him silently, and said in a cold voice: "If you don't believe this, do we have anything else to believe in? Find out the place first, and then say! Go, send someone to bring all the drawings back!"