In the school, almost all teaching buildings are about five floors, and most of the student apartments are no more than four floors. They are connected in rows and rows.

None of them are at a height that requires an elevator.

In such a large campus, there are not many places to install elevators.

There are dormitories for international students.

There are medical and chemical laboratory buildings that are slightly higher level and require a large amount of equipment to be transported.

There is an administrative office building about 24 stories high.

There are also two newly built high-rise dormitories that were completed less than three years ago.

One is the teachers' dormitory building.

...The other building is the dormitory building of the Department of Mathematics.

The reason why the Department of Mathematics can exclusively enjoy the benefits of elevator dormitories is because the Department of Mathematics originally lived in one of the oldest and most dilapidated dormitories in the school.

The second reason is that the president of Jinjing University was originally a professor in the Department of Mathematics.

And among the seven people they have now, there happens to be one from the mathematics department.

...Xie Xiangyu.

The originally broken relationship chain was vaguely connected by a weak connection.

But this correlation is not enough to prove anything.

Li Yinhang asked: "There is an elevator in the dormitory building of the Mathematics Department, can it prove that the person who left the recording is from the Mathematics Department? The Department of Medicine, the Department of Chemical Engineering, and even the administrative teachers in the office building cannot be completely excluded.

"

When she asked this question, Nan Zhou and the others were in the stairwell on the top floor of the mathematics department dormitory.

The stairwell is sunny.

Despite this, when the autumn sunshine shines on me, it is always cold.

Nan Zhou jumped down a step from the stairs.

He returned to the dormitory this morning and even thought of matching himself with a new outfit.

The soles of his strappy Martin boots tapped the ground, causing a crisp echo up and down the stairwell.

Nanzhou looked up at the still dim light tubes in the corridor and said, "There are some clues in the recording."

"What?"

"While he was escaping," Nanzhou said, "there was a voice in the background."

Li Yinhang tried hard to recall, but to no avail.

She had just been immersed in darkness at that time, and her whole spirit was highly tense.

The echoing, hasty footsteps could be said to have taken away all her attention, leaving her with no time to pay attention to him.

Nan Zhou looked at Jiang Fang.

Jiang Fang nodded and confirmed Nanzhou's judgment: "There is a 'buzzing' sound."

Li Yinhang: "..." So the bosses all have their own tape recorders in their heads, right?

She thought deeply based on this clue.

Buzzing sound…

"Buzzing"...

The way Nan Zhou looked up at the light just now...

Li Yinhang suddenly realized: "Light-sensing and voice-controlled lamp!"

Whenever you walk in a silent corridor late at night, when the light bulb captures the sound of footsteps, it will emit such a low buzz.

Immediately, the surroundings suddenly became bright.

...This is the subtle burning sound of tungsten wire.

The light bulbs in the school corridors and corridors are all provided by the same company, and their surfaces are coated with light-sensitive materials.

In other words, the time when the person who left the message fled was most likely late at night.

late at night.

There is an elevator.

And the person who left the message is obviously very familiar with the layout of the rooms here.

Familiar enough to be able to skillfully use elevators and unlocked rooms to avoid "rustling" sounds.

It's like living here.

Putting these factors together, it is not difficult to draw a conclusion——

The place where the person who left the message disappeared is most likely the dormitory building of the Department of Mathematics.

In this space where they are.

This stairway.

Li Yinhang stood up to pay tribute.

She asked bravely: "It's also possible... the person who left the message stayed in the laboratory building, office building, etc. in the middle of the night... Also, why did no one come out to help him when he was running like this in the dormitory building at night?

For a moment? Why didn't he ask someone for help? Since he is from the mathematics department, there must be people he is familiar with and knows in the whole building, right?"

Nanzhou: "Then prove it."

Li Yinhang: "How..."

Nanzhou: "Find that room."

If the person who left the message last appeared in the dormitory of the Department of Mathematics, then there must be an empty, unlocked room in a corner of the dormitory, near the elevator.

There is a metal cabinet in the room where a person can hide.

Not long after.

The three of them stood in front of a room on the fifth floor.

During the day on Friday, all the mathematics students went to class or to the library.

Seniors who have no intention of studying hard are also nesting in bed at this time, happily cuddling up with the quilt.

Therefore, there are few people walking around in the dormitory corridors during the day.

There was a suffocating silence.

Nan Zhou held the door handle, imitating the man that night, and slowly pressed the handle down.

As if afraid of disturbing the ghosts in the dark.

The lock spring made a dull and jerky popping sound, the sound was so small that it could be ignored.

But if you were the person who left the message trying to escape from death that night, the sound might be as loud as thunder.

As they expected, the door was not locked.

After a gust of cold wind passed by, the door opened inwards.

In front of the three people, it slowly unfolded its entire interior.

It's probably been a long time since anyone came here.

The evidence is a thin layer of dust accumulated on the light-colored floor tiles.

Just as Li Yinhang was about to go in, he saw from the corner of his eye that the two Nanjiang guys had no intention of going in, so they immediately shrank to the back.

Nanzhou said softly: "That's not right."

Then he looked at Li Yinhang again.

Li Yinhang felt like he was just a mediocre student who was selected in high school class and just wanted to get away with it.

As a last resort, she bit the bullet and looked at the ground in front of her like the two of them.

Probably because she was flustered, she looked at it several times but couldn't see anything special.

This is totally a utility room.

There are three or four cabinets standing in the room.

One of them is a transparent office bookcase with a sliding door inlaid with glass. Through the dusty light gray glass, you can vaguely see several empty dark blue file boxes stacked up and down inside.

The specifications of the other cabinets are exactly the same as the standard lead-gray iron wardrobes in school dormitories.

Broken and redundant wardrobes will probably be moved to this abandoned place.

There were several brooms in the corner that were either split or missing parts.

Stacks of express delivery cartons.

Six or seven chairs with the "Jinjing University" logo.
To be continued...