"One, two, three, four......"

Seeing Ling Xu counting something while walking, Mo Wanqing was a little puzzled: "Ling Xu, what are you doing?" ”

"I'm measuring how far dormitory No. 26 is from the corner of this hallway." While speaking, Ling Xu and the others had already arrived at the entrance of the corridor on the tenth floor, looking at the distance behind them, Ling Xu said softly:

"The layout of this dormitory building should be the same, with 30 dormitories on each side, a total of 60 dormitories, all of which are at the same distance, with a spacing of 4.2 meters between doors.

The building is designed with a single staircase, and the staircase corner is located on the far right, next to Dormitory 30, and the number plates of these dormitories are arranged in order, so that Dormitory 26 is located very close to the staircase, only 16.8 meters away.

I walked a total of 34 steps from the door of dormitory 26 to the corner of this staircase, and it took about 40 seconds, which ordinary people may think is very short, but for the murderer, this time is too long, because the longer the time, the easier it is to expose the murderer.

In that case, why did the female ghost choose to walk upstairs last night? What if I encounter a student on a different floor at the staircase turnaround? There is obviously an elevator in the dormitory building, but the murderer did not take it, but chose to walk, is she afraid of being photographed by the surveillance camera in the elevator? Or is there no time requirement? Not worried about running out of time? ”

"Not worried about running out of time? Ling Xu, what do you mean? How come I can't understand what you're saying? Mo Wanqing tilted her head sideways and looked at Ling Xu with a puzzled expression,

"It's okay if you don't understand it now, you will understand it later." After speaking, Ling Xu led Mo Wanqing to walk downstairs from the corner of the stairs, every step he took, Ling Xu remembered it silently from his heart, when he and Mo Wanqing came to the fifth floor, Ling Xu was already tired and a little panting.

Taking a few breaths, Ling Xu asked Mo Wanqing to lead him to her dormitory, and then under the leadership of Mo Wanqing, he walked along the corridor on the fifth floor towards the front, and the corridor was equipped with voice-activated lights, and as soon as he heard footsteps, the lights turned on by themselves.

Walking and seeing, Ling Xu looked at both sides of the corridor, the layout here was exactly the same as the tenth floor, not only the number of dormitory rooms was the same, but even the shape of the dormitory door was the same, white wooden door, cyan door frame, and a piece of transparent glass above the door frame.

Ling Xu silently followed behind Mo Wanqing, and when the two came to the door of Mo Wanqing's dormitory, they found that the police had also set up a cordon at the door of her dormitory, and a warning sign was erected next to the cordon, with the words "No Entry" written on it.

Crossing the cordon at the door, Ling Xu asked Mo Wanqing to open the dormitory, while he deliberately looked at the house number of the dormitory, and then looked at the house number of the dormitory opposite, Mo Wanqing's dormitory was dormitory No. 19, and dormitory No. 49 opposite.

Looking at the house numbers of the two dormitories, and then at the elevator entrance not far away, Ling Xu's eyes showed a thoughtful expression, and when Ling Xu was thinking, Mo Wanqing opened the door of her dormitory: "Ling Xu, come in, huh?" Why is it so messy? ”

Hearing Mo Wanqing's words, Ling Xu retracted his thoughts, turned around and walked towards the dormitory, at this time, Mo Wanqing had already turned on the electric lights in the dormitory, and looked at Mo Wanqing's voice, only to see that the dormitory was in a mess, bedding and clothes were thrown everywhere, and cosmetics and some small items on the table were also piled up in a mess.

There are four single beds in the dormitory, although they have all been turned over, but the items on three of the beds are relatively lightly turned, only one of the beds is more seriously turned, Ling Xu glanced at it, and said casually:

"You should have been inspected by the criminal police team here, that's why it's so messy, no wonder those people from the criminal police team took so long to inspect the scene, it seems that when they inspected the scene today, they also inspected this place."

As he spoke, Ling Xu entered the dormitory, looked around, he walked to the bed that turned the most seriously, needless to say, this must be Mo Wanqing's bed, Ling Xu spread the futon, took off his shoes, and then lay down on the bed: "Wanqing, you go outside and fiddle with the door lock of the opposite dormitory, and by the way, knock on the door of the opposite dormitory." ”

"Oh." Hearing Ling Xu's words, Mo Wanqing obediently walked out of the dormitory, and after closing the door of the dormitory, she came to the No. 49 dormitory opposite, gently shook the lock of the opposite dormitory, and gently knocked on the door of the dormitory.

"You knocked?" Seeing that Mo Wanqing was back, Ling Xu asked her.

Mo Wanqing nodded: "Hmm." ”

"But I didn't hear anything?" Ling Xu sat up from the bed and muttered with some confusion, "Could it be that your knock on the door is too quiet?" ”

After saying this, Ling Xu got up and got out of bed, he asked Mo Wanqing to lie on the bed, after Mo Wanqing lay down, Ling Xu walked out of the dormitory, closed the door of the dormitory, walked to the door of the No. 49 dormitory opposite, shook the door lock of the dormitory a few times, and then knocked on the door vigorously, after doing this, Ling Xu returned to Mo Wanqing's dormitory: "How is it?" Do you hear that? ”

Mo Wanqing sat up and nodded seriously: "Well, I heard it." ”

"Do you think it's the same sound as the knock you heard before?" Ling Xu sat on the edge of the bed and asked Mo Wanqing.

Mo Wanqing thought about it carefully, and then shook her head gently: "It's different, I was sleeping in a daze, and suddenly I heard a noise outside the door, intermittently a few times, I felt that it was a knock on the door, but I wasn't sure, because I hadn't woken up from a nap at that time." ”

"Staccato-choppy? On and off. When Ling Xu was contemplating and pondering, he suddenly noticed one thing, that is, through the transparent glass above the door frame, he could actually see a slightly dim light outside.

Because Ling Xu knocked on the door loudly before, the voice-activated lights in the corridor turned on, and since Ling Xu was talking to Mo Wanqing in the dormitory now, there was no movement outside, so the voice-activated lights went out by themselves.

Seeing this, Ling Xu suddenly moved: "Wanqing, I remember you once said that when you heard the sound at the door, you thought that your roommate forgot to bring the key, so you turned on the light and walked to the door to open the door, but when you opened the door of the dormitory, by the light of the corridor, you found that there was nothing outside the door and in the corridor, right?" ”

Seeing that after she finished asking, Mo Wanqing nodded in response, and Ling Xu showed a playful expression on her face: "Since you saw the voice-activated light in the corridor turn on at that time, it means that there must have been a sound outside, otherwise the voice-activated light will not be turned on."

This voice-activated light is only turned on for about ten seconds, if there is no follow-up sound maintenance, the voice-activated light will automatically go out, when you open the dormitory door, since the voice-activated light is still on, it means that the sound does not appear for more than ten seconds.

You didn't see anyone from the outside after you opened the dormitory door, and no one ever entered or exited the dormitory, so there can only be one explanation, the sound came from a certain dormitory, when you were woken up and turned on the electric light, the light was reflected on the ceiling of the corridor through the glass on the door frame, and the other party saw the light on, immediately alerted, and immediately stopped moving. ”

Analyzing this, Ling Xu paused, and then looked at Mo Wanqing: "Wanqing, which dormitory did you say that after the sound came out, it would make you mistakenly think that someone was knocking on the door of your dormitory?" Which dormitory can see your lights from the ceiling? (To be continued.) )