I checked every desk drawer in the classroom, but I couldn't see the shadow of the imp.

And Yin Yaoyao checked every floor and wall, and did not find a hollow secret door.

For a moment, the actions of the two of us were at an impasse.

If it is really as I expected, the imp runs away on his own again with long legs, then it is absolutely impossible to find it.

Now the only clue I can trace is the cross key given by Li Chonghua, but which lock does this key correspond to, and where can I find it? Minutes ticked by, but we still didn't get anything.

At this time, Dean Li glanced at the Omega Speedmaster on his wrist and urged, "Excuse me, I apologize, there is a class schedule in this classroom at one o'clock in the afternoon. Please as soon as possible. ”

"I've found all the places I need to find, let's look elsewhere!" Yin Yaoyao also glanced at his small watch, "There is a customary rule in our industry: you can't conduct an investigation in the same place for more than an hour. Because the longer it drags on, the more variables there are, and the higher the risk factor. ”

I also began to hesitate when Yin Yaoyao said this, but I was still sure that I didn't misunderstand the location of the little ghost, so I gritted my teeth and said, "Keep looking!" ”

However, after another ten minutes, interns came in the classroom, and it seemed that the class was ready to start.

Dean Li found this opportunity to bombard us: "I'm sorry, it's time for class, I'll take you away." ”

"Today's class is cancelled!" Yin Yaoyao also glared at Dean Li unceremoniously.

Dean Li was not worried at all: "Miss Yin, you can figure it out that these interns have nothing to do with our hospital. If you cancel their classes with a single sentence, it is not our hospital that will be delayed, but the academic progress of these students and the teaching progress of the university. ”

Yin Xiaoyao obviously didn't want to involve irrelevant people, so she had to pull me out of the classroom.

However, Dean Li was forced to stay in the classroom by Yin Yaoyao and was not allowed to leave.

On the corridor outside the classroom, Yin Yaoyao and I stared at each other for a while, and we both found doubt and helplessness in each other's eyes.

"If we can't find evidence today, it will be very difficult to investigate in the future. First, the summit no longer supported me, and even suspended me; Second, today, Dean Li will definitely strengthen his precautions...... What to do? Yin Yaoyao's face was lost, and her eyelids drooped.

I was also hesitant in my heart, and said, "Anyway, we already know that it is a little ghost raised by the dean, why don't you just dispose of him?" lest he continue to harm others! ”

"Of course not...... The state has indeed given Yong'an Lane special rights, and I can go beyond the scope of the Criminal Law to convict people like President Li. But only if there is evidence. So, if you can't find the imps, it's all empty talk! ”

As a result, all the roads I could think of were blocked.

I paced back and forth in the hallway, and as I passed the doorway of 208, I caught repeated glimpses of Dean Li's mocking and smug smile.

Looking at his smile, my heart was furious, and without paying attention, I suddenly bumped into an old man who came to clean the toilet.

"Young people...... Walking and looking at the dots...... "The old man didn't care, wearing clothes with patches and carrying a broom.

I was about to say I'm sorry, but when I saw his clumsy back, I suddenly remembered a person—

Give me three tips Wang Quan!

Wang Quan, like this old man, was rickety and ragged.

That's right!

Wang Quan wrote three sentences on the first bag I received, and the third sentence was to tell me to open the No. 2 bag if I encountered something that was really difficult to choose.

I've always carried these three tips with me.

So, I immediately opened the number two bag.

This time, the words on the bag are far more concise than the No. 1 bag, with only two sentences.

First sentence: "Walk back and forth in the hallway, look at the walls, and you will find something different." ”

The second sentence is: "After solving the case, if the girl of the Yin family takes the initiative to cooperate with you, you will dismantle the third one." ”

The second sentence is to explain the timing of my opening of the No. 3 bag, not to provide me with clues.

But the first sentence really pointed me in the direction of finding a ghost!

This Wang Quan is simply terrifying, these three tips were given to me by him yesterday, but he has foreseen all the details of what is happening around me!

Anyway, from these three tips, it seems that he and I are friends and foes.

However, I still haven't figured it out, how could such a powerful person as Wang Quan be trapped in a mental hospital before?

But now is not the time to delve into this issue carefully, finding the little ghost is the most important thing.

So I followed Wang Quan's words, stared at the wall, and walked up and down the corridor.

Yin Yaoyao looked at me puzzled: "What are you doing?" What is written on the note? ”

I ignored her, and by this time, my attention was completely drawn to the wall.

Because, I really found an extremely unusual place-

The thickness of the partition walls between each room is very unusual!

For example, the partition wall between 207 and 206 next door to classroom 208 is only about half a meter smaller.

But the partition wall between 208 and 207 is about one meter and a half!

Could it be that this is a load-bearing wall, so it looks very thick?

To test my idea, I ran to the third and fourth floors to check it out.

However, whether it is the partition wall between 308 and 307, or the partition wall between 408 and 407, it is only half a meter.

The walls before 208 and 207 were three times thicker!

I see, although there is a solid wall behind the blackboard in classroom 208, this is still an extra brick!

"I see!" I couldn't hide the excitement in my heart, and said to Yin Yaoyao, "The little ghost is behind the blackboard, knock on the wall behind the blackboard, you can definitely find it!" ”

"......" Yin Yaoyao looked at me blankly, a little speechless, "Are you serious?" If the imp is built to death in the wall, how can Dean Li make offerings to the imp? ”

Being reminded by Yin Yaoyao like this, I suddenly remembered the key Li Chonghua gave me.

In this way, the key is not the key to the safe, but the key to unlocking the solid wall.

It's just that I've just looked at the classroom, and there isn't a single keyhole in it that can correspond to a cross-shaped key.

In this way, the clue is broken again.

"That's it...... Let's go to another room and take a look, you wait for me to go to the bathroom first. Yin Xiaoyao shook her head, got up and walked quickly to the women's bathroom.

However, there was another detail in my mind.

I don't know why, at this moment, my brain is like a floodgate, and all the details about Dean Li are flashing through my mind like a movie-

When Dean Li took us to the second floor, the first thing he did not go to open the door, but to go to the toilet.

Thinking of this, I immediately rushed into the men's bathroom.

The toilet in the medical laboratory building is clean and there is no filth such as feces and urine to "restrain me", so my efficiency is very high.

Soon I rummaged through every corner of the men's restroom, and finally after opening one of the floor drain covers of the toilet, I finally found a cross-shaped keyhole.

I was finally relieved that after an hour of intense experience, the truth was finally in front of me!

Finally, I inserted the key into the keyhole and flicked it to the right.

After about a few seconds, there was a sudden exclamation from the classroom:

"This ...... What's going on......"

"There's still such a mechanism in the hospital! Awesome! ”

"I finally witnessed the black technology in the TV series......"

"Wait! What's that! It's disgusting! ”

The voice was chaotic and noisy, needless to say, it was from the interns who were in class.

Something absolutely unusual is happening in the classroom.

Yin Yaoyao and I rushed into the classroom at the first time, and immediately smelled a strong rancid smell.

Dean Li had already collapsed in the corner with a pale face, looking at us in a panic.

A wall in front of the classroom had fallen diagonally, the edge of the wall being pulled by a number of flexible steel supports.

And that strong rancid smell is coming from inside the wall!

Yin Yaoyao and I walked around the wall, ran in to take a look, and sure enough, we saw a small dried corpse.

It's a girl's dry corpse, crumpled. She sat cross-legged with a bunch of stinking human organs around her, including human hearts, lungs, kidneys, etc.

"Dean Li! Let's explain! The corners of Yin Yaoyao's mouth finally hooked up a relieved smile, and in front of the interns, he took out the PPK pistol.