"Which direction does this vent lead to?" I asked Wang Yongdao.

"The structure inside the vents is very complicated, there are a lot of pipes, the internal ventilation ducts that connect the walls on each floor, it can be said that except for the exhibition hall, every office has a vent, but the final air intake should be outside the roof of the fifth floor, but ...... You don't think that thief really climbed in from the roof, impossible, such a narrow place, impossible to climb people, if you get stuck inside, I'm afraid you won't be able to get out for the rest of your life......" Wang Yong said.

I ignored Wang Yong's prompt, but walked to the window of the office, opened the window, and looked down from the inside.

I closed the window, took a deep breath, turned to look at Wei Wenlong, and said in a deep voice:

"Wenlong, you do the math, according to the normal layout of the building, if each floor has vents that extend to the periphery, then these vents must have a junction on each floor.

Yu Wenlong's eyes were shining, he held his chin in one hand, looked at me without thinking, and said:

"It's just above the central hall, and it must be where all the ventilation ducts meet."

"Yes, I think so, too." I flicked my fingers and smiled slightly. So, Wenlong, next, I'm going to trouble you for a favor, Wenlong, next, I want you to do this......."

Yu Wenlong looked at me squarely, and in his copper-brown pupils, the iris slid with a circle of brilliance.

I pinched my fingers and said slowly:

"Wenlong, help me take care of this place, I'll go out first, I'll be back in a while."

A hint of brightness flashed in Wei Wenlong's eyes, he nodded, stuffed the last red date into his mouth, and said:

"Okay."

I nodded and looked at Yu Wenlong, then at Huxian and Wang Yong, and then exited the office. After leaving the museum, I immediately went to the nearest Shanghai hospital, from which I got ammonia, masks, gloves, ejectors and other tools and chemicals.

Saying that I had prepared the necessary supplies, I was now waiting quietly at the bottom of the museum, and received my text message, and Wei Wenlong went downstairs without hesitation, and I asked the eight guards at the entrance of the museum to cooperate with Wei Wenlong's actions, and handed over the ammonia and other equipment I got from the hospital to Yu Wenlong, and then returned to Wang Yong's office.

Wang Yong and the fox fairy were bored in the office.The fox fairy was holding a jade illustrated book of the Song Dynasty in his hand, and he flipped through it without looking at it.Seeing me.The fox fairy threw the book away.Stood up lazily.

"Kitsune, your feelings haven't gone away, have you?" I glanced at her and asked.

"Yes." The fox fairy standing at the doorway replied indifferently, and her expression did not change.

"That's good."

I made up my mind, I stepped onto the desk, then I turned around and lifted the mahogany chair in the corner and put it on the table, and then I stepped on the mahogany chair, and I raised my hand just enough to touch the vent directly above the desk. I lifted my hands and touched the metal cover of the vent. I stuck my fingers in the gap of the vent cover, and I pulled the vent cover out of the pipe completely.

A stench came over my cheeks, ruffled a few strands of my hair, and I found that along with the vent cap, I pulled out a fishing line that was connected to the inside of the vent pipe.

I laughed at the fishing line in the gap in the ventilation cover, because I knew the truth, and I was so close.

I unplugged the fishing line, and then asked Wang Yong to hand me the wooden broom in the room, I unscrewed the broom handle of the broom, and then inserted the end of the broom handle into the inside of the vent duct. It was pitch black, and I couldn't see anything. So I took out my phone, turned on the flashlight lighting function of my phone, and looked inside.

The inside of the vent is quite deep, as Wang Yong said, it is indeed very narrow, and it is indeed difficult for ordinary people to climb in and out through this vent.

But...... What if that person is not an ordinary person?

I took a deep breath and shouted into the ventilation duct:

"No need to hide anymore, I know you're hiding inside." As I spoke, I was frantically banging on the inside of the pipe with the broom handle, and the metal sound was faster and clearer than the air, and the sections in the ventilation duct were connected, and I was banging at one end, and I could feel the vibrations in all directions of the pipe very quickly.

Bang.bang.

The screeching sound of metal knocking reverberated through the ventilation ducts in the museum's ceiling, and over and over again.

But as soon as I stopped tapping, the inside of the pipe quickly became quiet again, as if there was no one at all.

"No need to hide anymore." I shouted again. We know you're hiding right now in the confluence of pipes between the fourth and fifth floors... All the dirt you've stolen is there, you're not coming out, we're going to surround all the entrances and exits, and we're going to take the most thorough inspection."

After speaking, I turned to Wang Yong and said:

"Wang Yong, shout for you."

Wang Yong looked at me dumbfounded.

"Me."

"That's right, if there are multiple voices shouting at the same time, it's easy to give the person who might be hiding in the pipe the illusion that there are a lot of police in the museum, and make him think that there are a lot of people, so it can create psychological pressure."

"That's what I thought I was...... But, do you really think there's someone hiding in the pipes?" Wang Yong looked at me suspiciously.

"Just do what I say, keep shouting, don't stop." I squinted and smiled, then patted Wang Yong on the shoulder, jumped off the desk, and said. You're banging on the pipes with broom handles, you're trying to force people out of the pipes, you're warning and threatening her, you're going to tell her that the downstairs and the main entrance of the museum are surrounded by the police, and there's only one exit from the museum, so she's going to run away in the direction of the roof."

As he spoke, I walked towards the door of the office, and then I looked at the fox fairy and said:

"Let's go, fox fairy, I think the demonic aura you feel has nothing to do with the person hiding in the pipe."

"You already thought that the little mouse that burrowed into this hall was the young demon?" The fox fairy's red lips are bright and dripping, and there is a hint of approval in her beautiful eyes.

"Judging from the direction you described, it is very consistent with the location of the thief hiding, after all, there is no staff in the museum now, and the person hiding here could only be a thief."

I walked to the corridor outside the museum, and without looking back, I explained to the fox fairy walking behind me.

Because the structure of the Shanghai Museum is hollow, surrounded by corridors on all sides, the outer hall is directly above the ceiling of the fifth floor, and in the center of the ceiling is a number of vents, where all the vents meet, and it is also the thickest wall.

I ran quickly along the corridor on the third floor in the direction of the fifth floor, up the stairs, and in a few moments I ran to the corridor on the fifth floor. The office on the fifth floor was on my left, and at the ceiling of the Shanghai Museum above my head, there were also two vents that I could climb into.

"No need to hide, I know you're here."