In the smoky office, Yan Feng took a deep puff of cigarette and slowly spit it out.

In the end, there was still no result, Wang Hongjie still didn't see anyone alive or dead, but Yan Feng knew that he was probably already more than lucky-even if he was the real murderer of the fierce police murder case, when he encountered that demon, I am afraid that he would not be able to escape the fate of being devoured.

It was not that he did not try to pass on the information to his superiors and express his conjectures, but the reply from his superiors was only four words - insufficient evidence.

This made him feel very distressed, in fact, not because of the lack of evidence, but because the uploaded material had been modified by a mathematician halfway through.

After staring at the screensaver of the computer for a while, he finally decided to take out Wen Yifan's information again and read it carefully.

"Team Yan, haven't left yet?" Liu Wenyu's voice came, and Yan Feng nodded when he heard this, "Yes, although it is already the National Day holiday, but the murderer has not been found, I still can't take a holiday." ”

"Team Yan is still suspicious of Teacher Wen?" Xu Wenxin's voice also came: "Hasn't it been confirmed that Teacher Wen has sufficient alibi evidence?" Why look it up? ”

"I don't know why, I just feel that this person is so perfect, so perfect that people want to doubt the truth of it," Yan Feng's brows furrowed slightly, "He has been in Yunhe for four years, and he has not had a single illegal record or traffic violation, do you think this is normal?" ”

"It's not too much of an exaggeration!" Xu Wenxin thought for a while and said, "Team Yan, you have also seen Teacher Wen's home, how neat and clean it is, what if Teacher Wen is just a meticulous person in life?" ”

"In this way, it's pretty much the same," Team Yan nodded, "After all, there are all kinds of wonders in the world, and it's really possible that Mr. Wen is such a person who pays attention to details everywhere!" ”

"Perhaps, it may also be that I am too sensitive, after all, nine years ago, Mr. Wen was only eighteen years old, although the 'Yunxiang Murderer' is indeed a young man, but it is a little unreasonable to do it like this at the age of eighteen," putting away a few photos of the scene at that time, Yan Feng sighed, "It disappeared again after a flash in the pan, and I still haven't caught that demon, but should I go to Mr. Wen to apologize?" ”

"No, Team Yan, Teacher Wen is very reasonable, he must be able to understand," Xu Wenxin smiled, and Liu Wenyu pursed his lips when he saw this: You have only known Teacher Wen for a short time, "And I don't blame Team Yan for being so sensitive, after all, he can do that kind of thing...... Is it really human? ”

"We'll have to wait for the day it's caught," Yan straightened his collar, "is this all the disappearances that have happened recently?" ”

"That's right, the two of us have printed out all the disappearances in the past six months," Liu Wenyu said, "but there doesn't seem to be any pattern in this." ”

"The 'Yunxiang Murderer' is an indiscriminate murderer," Yan Feng took the information, flipped through it a little and put it on the table, "But then again, you two haven't finished dinner yet!" ”

"Not yet, after all, the case has not been solved, and the superiors can't let us go." Liu Wenyu scratched his head.

"Only when you have enough food can you have the strength to work," Yan Feng smiled very rarely, "The body is the capital of the revolution, let's put down the work in hand first, just today we will work overtime, I invite you to eat something delicious." ”

"Really?" When Xu Wenxin heard about eating, her eyes widened, "I want to eat spicy fragrant pot!" ”

"Okay, it just so happens that I know that there is a spicy fragrant pot nearby that is doing well, clean it up, I'll treat you." Team Yan smiled and nodded.

"Long live the captain!" Xu Wenxin cheered, pulled Liu Wenyu and ran out of the office.

Looking at the backs of the two of them in the distance, Yan Feng shook his head with a wry smile, also took off his serious police uniform, put on a coat at random and went out.

He didn't notice a single photo in the pile of documents.

The back of a vague person.

Of course, who can find out what is such an inconspicuous photo?

………………

"Maybe we should change our tactics," Zhang Yu looked at the two in front of him, his expression was a little serious, "We were all tied to a logical trap, always focusing on the game, in fact, the game is not important, the important thing is to piece together our own story completely!" ”

"But how do you put it together?" Liu Xin was puzzled, "Looking for someone to confess?" ”

"There may be some difficulties in this, or in other words, there is not a single thing that can make everyone try to let go of old thoughts," Zhang Yu pondered for a moment, "Why don't the three of us confess to each other, as members of the same group, I hope that everyone in my group can confess to each other, even if they don't know the story they are in, it is good to talk about their profession and the city where they live." ”

"My name is Liu Xin, and I am now a college student, studying architecture at Fenghe University in Fenghe City." Liu Xin said.

"My name is Yang Yong, 43 years old, and I am the vice president of Yichuan Fifth Hospital, majoring in psychiatry." Yang Yong continued.

"Yichuan, that means you are from Yichuan?" Zhang Yu frowned slightly, "I am also one of the members of the Criminal Police Brigade of the Yichuan City Public Security Bureau, is it possible that you and I are in the same story?" ”

"It's very likely," Yang Yong nodded, "But, I didn't commit any murders!" ”

"It may also be unintentional, as the owner of the house said, you and I are both murderers," Zhang Yu analyzed, "However, I don't believe that he is a messenger of justice, or that he may also deliberately give this condition to fool us." ”

"Yes, there is also this possibility...... A strange light flashed in Liu Xin's eyes, and this look should not be able to escape Zhang Yu's eyes.

"Liu Xin, you say you are ...... A college student in the Department of Architecture? He suddenly asked, "So, can you crack the mechanism of the rotating room?" This might be useful to us. ”

"It's probably a bit of a pity, I really can't crack the mechanism of the rotating room without seeing the model," Liu Xin sighed, "Its internal structure should be very complex, and listen to the sound of rotation...... Seems to be wooden? ”

"It's strange, isn't the owner of the house powering up this mechanism?" Zhang Yu frowned, "Wooden...... The wear and tear in it should be very severe, how did he do it? ”

They slowly walked through the countless corridors on the second floor that intersected in the shape of a "well", the wooden floor made a "squeak" sound, Zhang Yu's gaze swept across the rows of rooms, and his gaze suddenly stopped on a certain calligraphy and painting.

It was written in cursive with the word "mortise and tenon".

"Liu Xin, you are a student of the Department of Architecture, are you familiar with the mortise and tenon structure?" Zhang Yu immediately asked.

"Of course, our compulsory course is to disassemble and install the horizontal mortise and tenon structure, and ordinary Luban locks are naturally not a problem." Liu Xin replied.

"That's right, maybe that's what the owner of the house said, any room that can be entered can be entered, in other words......" Zhang Yu walked quickly to the calligraphy picture, took down the calligraphy and painting, revealing the appearance behind it, "This room is for you." ”

The space behind the painting is a cube-shaped hollow, and in the void, there is a cuboid box.

The cuboid box had several rows of square protrusions, arranged neatly, as if they were some kind of decoration, but they added a touch of complexity to the simple box, like a music box.

"This is ......" Liu Xin stepped forward, "This is a ...... Luban lock? ”

"Very likely, look here," Zhang Yu pointed to the inside of the cube hole, and they realized that there were nine small holes with complex internal spaces, as if they were keyholes, but as if they weren't.

"I think you need to take the nine parts in this box and put them together, and the door will open." After Liu Xin carefully observed the Luban lock, he said: "This box uses the technique of mortise and tenon, which should be encrypted with nine rings, and these small protrusions of the squares should be the nine long parts that we need to disassemble." ”

"Can't you just destroy it and then remove it?" Yang Yong asked.

"It's difficult, or impossible," Liu Xin said as he turned the small box back and forth, "It takes a lot of effort to disassemble such a hard wood, and once the structure is violently destroyed, it may cause the entire mechanism to be completely stuck and unable to be opened, and even if it is really disassembled, any scratch on the nine parts may cause it to fail to insert into the mechanism perfectly." ”

"Can you crack it?" Hearing this, Zhang Yu asked.

"Yes, it's just a nine-in-a-half, and it's relatively simple to find the rules." Liu Xin's hands kept roaming on the wooden box, and those small squares were constantly pulled out and pushed by her, and there was a crisp collision sound between the brackets, like a piece of music.

"Whew~ It's finally done." Ten minutes later, Liu Xin wiped the sweat from her forehead and inserted the nine complete and complex parts into their respective holes, and only then did she successfully open the wooden box after at least a few hundred operations.

"Click--" When all the parts were fully inserted, there was a collision sound of countless activated mechanisms behind the entire wall, and with a "click", the door opened.

It was still an empty room, still a table in the center of the room, but this time, it was a square box.

It was a little wireless headphone.

"With this, maybe we can communicate with our teammates quietly during the game," Zhang Yu gently picked up the small headphones, "In this way, we will have the confidence to form a team." ”

"Teaming up?" Yang Yong was puzzled, "Which group does Officer Zhang want to team up with, if you want me to see it, Room 6 seems to be a ......."

"Ahh

"Dead ...... Dead! The screams of the crowd came from the third floor, followed by the sound of footsteps coming from different floors......

On October 2, at 22:14 p.m., the first deceased appeared......