The silence around was terrible, the neon lights had long since been extinguished, and the buildings of the old city in the night seemed to have become ruined walls, ghosts, and a cold wind howled, like wild beasts roaring at the night sky with their heads up, bringing a creeping ghostly gasp and a frantic laugh...... The nightmare of fragmentation is slowly unfolding.

"What sound?" Ah Qin asked softly.

"No, I don't. Did you hear anything? Gao Yue asked.

"yes, I didn't hear that either." He Bin also looked at Ah Qin in surprise.

Dr. Liu closed his eyes.

Everyone held their breath and stopped making a sound.

Suddenly, a terrible cry came, just after a pause, and then another ghost crying wolf-like howl sounded from far and near, and Ah Qin was frightened.

Everyone looked at Ah Qin with a blank expression.

It turns out that this voice can only be heard by Ah Qin alone! No one else can hear it, why?

Doctor Liu motioned for the two young men to take out the instrument and place it next to Huaji.

It was a small machine, looking like a strange loudspeaker, with a lot of meters on it, and a lot of wires of various colors.

The two lads put on their headphones and got busy.

It took about half an hour or so. During this period, the voice sounded four or five more times, and every time it sounded, Ah Qin was so frightened that he couldn't do it, while the others were unaware and looked at Ah Qin's frightened appearance in surprise. He Bin walked up to Ah Qin and patted her on the shoulder. Gao Yue also nodded to her, telling her not to be afraid.

Gao Yue lit a cigarette and looked at the blood-colored mist in the sky, stunned. He thought about what the low security guard said that night: Actually, in the years when it was deserted, a dozen people climbed on top of our building to commit suicide...... According to the former security guards, in the middle of the night, the sound of people crying can be heard here...... It wasn't until later, after the renovation was completed, that the popularity began to flourish, and people occasionally heard these cries at night, which was terrifying...... I was scared at the time, but what was the specific sound? I can't describe it, and I can't remember it now...... It seems that the voice is close and far, loud and small, sometimes poignant, sometimes wailing......

Gao Yue walked up to Ah Qin, patted her, and asked softly, "What is the voice you are listening to?" Can you elaborate on that? ”

Ah Qin shook his head, looking palpitating.

"Isn't it composed of many syllables combined, near and far, big and small, it sounds very three-dimensional...... It seems to come from the ground, and it seems to come from the air...... It seemed to come from the left, and it seemed to come from the right, one moment it was very sharp, and the other it was very low. Sometimes poignant, sometimes wailing? Gao Yue asked.

Ah Qin nodded desperately and looked at Gao Yue.

The two young men finally got it done, they put away their instruments, walked over to Dr. Liu's ear and said a few words.

Physician Liu nodded, lost in thought.

Everyone looked at him curiously, expecting an answer.

He looked up at the dark blue and blood. I didn't mean to speak right away.

"What the hell is this sound? What is this machine used for? Gao Yue finally asked.

"Now, I can tell you unequivocally that there's no ghost here. These sounds are all artificial, someone has installed a sounder somewhere near here, and every day at two or three o'clock in the morning, the sound that Ah Qin heard just now is played from time to time, and not everyone can hear it. Physician Liu said slowly.

"Why?! Is it true that each of us has a different structure of the ear? He Bin asked in surprise.

Ah Qin was even more puzzled.

"This sounder, these weird and weird horror sounds played, are divided into bands and high and low frequencies, and in a certain high-frequency place, there are only certain people...... People who are in a good physical condition for this band and frequency can hear it. Therefore, only Ah Qin could hear the voice just now, and none of us reacted...... That's it. Dr. Liu continued.

"Really?" He Bin didn't believe it.

"Our set of instruments was produced in the former Soviet Union at that time, and it was specially used for astronauts to listen to band analysis in space. Now in the country, no more than three. The specific scientific principles are very complicated, and I can't explain them to you clearly. Physician Liu said.

Everyone still didn't believe it, but just now, only Ah Qin could hear it.

"Still, tonight's harvest is quite big. First, we confirmed the existence of room 3404, and also knew that the murderer was a master, with so much equipment in it, and a pattern was left; Second, we know that Han Yun should have been pushed down by the murderer in room 3404, not on the rooftop; Thirdly, the murderer has installed a lot of mechanisms in the Tianyue Building, and he hides in the shadows and knows our whereabouts very well; Fourth, the murderer played terrifying sounds of different bands in the middle of the night, deliberately creating ghost stories, which made people feel afraid of Tianyue Building. The above four aspects are the conclusions we can draw so far. Dr. Liu continued.

"Thank you. It seems that it is really the top level in the industry, both in terms of equipment and personnel, which has opened our eyes! Gao Yue patted Doctor Liu on the shoulder.

Ah Qin and He Bin also nodded.

"So what's next? What should I investigate? Gao Yue asked.

Physician Liu pondered for a moment and said, "Let's start with three aspects, first of all, being able to install so many equipment in room 3404 must have occupied the room for a long time, we have to check carefully, who lived in this room for a long time before Han Yun's death; Secondly, continue to dig up the material on the two security guards to see who has investigated the monitoring room before, however, the possibility of the murderer is not very likely, unless it is before Han Yun jumps off the building, he goes to the monitoring room to inspect, it is possible. Next, we need to start with this weird sound, come over at this time of the morning every day, slowly find the location of the sound source according to the height and band of the sound, and then follow the vine to find the person who installed the sounder; In the end, we still have to monitor Ah Tian to see what he is doing, and we will also find a special channel to get to know the background monitor of the police station to see if the confession is forged...... Lawyer Tang, please leave it to you! Doctor Liu patted Gao Yue.

"Great detective, as soon as you analyzed it like this, we immediately found the direction. Sure enough, it's professional, admire it! You're going to have to come here every morning in the early hours of the morning to find the source of the sound, and it's really hard! The spirit is commendable. He Bin said loudly.

"To be a detective, you still have to have professionalism...... and a sense of justice. Physician Liu said firmly.

Gao Yue saw it in his eyes and thought: This birdman, he will soon go to the sky with two words of praise. Even a sense of justice came out.

"Okay, everyone has worked hard, it's almost four o'clock in the morning, let's go back and rest quickly, I'm tired today." Gao Yue said to everyone.

Because they drank alcohol and couldn't drive, Gao Yue and the three of them walked to the intersection to wait for a taxi.

"Big brother, this Detective Liu, how do you speak one by one, what you just said today that there are four major gains, and then you have to start from three aspects, it is simply a leader's speech!" He Bin laughed.

"But it's still quite level. Maybe he was a police officer before he went to sea. He continued.

Gao Yue laughed. He pulled out his cigarette case and found that it was already the last one.

……

Ah Qin's mind was heavy, and his face was tired.

In the old houses in the distance, the lights of several houses were already lit up, and the sky was slightly brighter, and the blood red just now slowly spread outward, but it was still in the embrace of that dark blue...... The sky at more than four o'clock in the morning has no heartiness of the morning, no brilliance of the sun, and no artistic conception of night...... Everything seems so special.

Ah Qin looked at the horizon and fell into deep thought...... She thought, Xiao Yong may be looking at this sky, perhaps, survive the darkness before the dawn, survive the most difficult time, and then usher in ...... Alas......

Gao Yue saw it in his eyes and immediately said:

"Anyway, the efforts made from last night to now have not been in vain, at least we know a lot of the situation, and we have seen some hope, it will not be like before, headless flies touch everywhere, and I don't know if I ......am played by others."

Ah Qin didn't seem to hear, she was still immersed in a feeling of sadness.

Gao Yue and He Bin were silent, they thought about how to comfort her.

It's past four o'clock in the morning and it's hard to get a taxi to pass by. Gao Yue simply sat on the stone pier on the side of the road, slowly smoking the last cigarette.

He Bin found that the corners of Ah Qin's eyes were already full of tears.

"I remember when I was a child, I read a sentence written by a writer, and I felt it very much." Gao Yue said suddenly.

"What words? Which writer said that? He Bin asked.

"I don't remember which one said it, he said: life can't be as good as you think, but it's not as bad as you think. I think that people are more fragile and strong than I imagined. Sometimes, I may be so fragile that I burst into tears at a single sentence, and sometimes, I find myself gritting my teeth and walking a long way......" Gao Yue said softly.

As if it was the last sentence that moved Ah Qin, she nodded and repeated softly: "Sometimes, I also find myself gritting my teeth and walking a long way......"

"However, I don't know how long this road is...... How long will it take......" she looked sad.

He Bin looked at Ah Qin and patted her on the shoulder.

Gao Yue finished the cigarette and threw it into the trash can next to him. Then he stood up and said loudly to Ah Qin: "It won't be long, the cold winter has come...... Spring is not far away. Don't be so discouraged, don't worry, we will definitely find the answer and clear Xiaoyong's grievances! When he comes out, I'll give you a good celebration! ”

Ah Qin nodded and looked at him gratefully.

"No, brother, I suddenly felt that I was so lonely, I don't know why, my heart is very lonely and lonely......" Ah Qin's tears flowed.

"I remembered that we had only been together for a month or two...... Although it took a long time to wait before, happiness came so suddenly, but it left even more suddenly...... Woo woo...... "Ah Qin's compassion comes from the heart."