The Technical Investigation Department copied the song "Black Sunday" in the song ordering machine, and after comparing the frequency response curve, it was found that there was a three-minute difference between the song this time and the song in Ning Xiaobai's mobile phone.

In other words, on the basis of the song in Ning Xiaobai's mobile phone, which has been adapted for three minutes, it has been adapted for another three minutes.

Now, it's been six minutes since the adaptation.

"How did it change for another three minutes?" I looked at the frequency response curve on my computer screen, and my brain went blank.

"The song appeared at both crime scenes, and it was constantly updated. This shows that these two suicides were by no means accidental, but carefully planned. Li Meng also let out a cry of surprise.

This case, by now, has completely changed its flavor.

"If Ning Xiaobai and Qiao Jiaxi's deaths are not suicides, but the murderers let them die through music and a certain environment. Then this case can be called a perfect serial murder case. I said in a deep voice.

"For every person the killer killed, he would adapt the song for three minutes. What was the murderer's purpose in doing this? And how did she update the song in real time and complete the killing? ”

"Zhang Yajing!" I took a deep breath and said seriously: "Zhang Yajing must be the key person in this case, and she didn't leave any flaws and clues for us at that time. ”

Li Meng nodded and agreed: "Zhang Yajing is indeed suspected of committing a major crime, but there is no evidence to accuse her." The most critical point is, how did she make Ning Xiaobai and Qiao Jiaxi commit suicide? ”

I pondered for a moment, and came to a very scary conclusion: "Unless she can manipulate other people's consciousness, such as hypnosis, illusion and killing." ”

Li Meng looked at me in a daze, and at this moment, we all thought of a familiar name - Ling Gu Feng.

We have encountered hypnotic murder more than once, from Jin Yan's instantaneous hypnosis, to Shen Baijun's shadow murder, and Shen Baijun and Ling Gufeng's hypnotic battle.

Is it another case of hypnotic murder?

This kind of case is not only a superb and bizarre modus operandi, but the most important thing is that there is no way to collect evidence.

"It seems that we should take a good look at this Zhang Yajing, since she was born, after investigating her whole person thoroughly, there will be clues." I settled down and took Li Meng to the Technical Investigation Division.

At this time, we need to find a hacker who is obsessed with fighting landlords.

Pushing open the door of the Technical Investigation Division, I saw Xiao Xuan.

Xiao Xuan was sitting at his desk playing Gold Miner, he was a hacker who was brought in by Shen Ruoshan Zhao'an, and he did not belong to the police establishment, but he enjoyed equal treatment.

So when he went to work and fished, everyone didn't see it.

"It's rare that our hackers didn't even play landlord fighting." I pushed the door open and walked in, joking with him.

Xiao Xuan's attention was still on the gold miner's claws, and his eyes swayed as the claws swayed from side to side.

"The Happy Beans are all lost, and I have to wait an hour to get them, so I can only play something else." Xiao Xuan said lightly.

"Hurry up, stop playing, investigate someone for me." I walked over to Xiao Xuan and tapped my fingers on the table.

Xiao Xuan had no choice but to quit the web game and looked at me in a daze: "Brother Qin, who are you going to investigate?" Stealing someone's privacy is a crime, don't you know? ”

I narrowed my eyes and saw that he didn't speak.

Xiao Xuan originally wanted to blackmail me, even if it was to recharge him with some happy beans. But when he saw my face, he immediately changed his words: "Okay, who are you going to investigate?" ”

I took out a piece of Zhang Yajing's identity information from my pocket and handed it to her, and said seriously: "Check this person, and find out everything she has for me." ”

After listening to me, Xiao Xuan was instantly stunned, revealing an unbelievable expression: "Everything? ”

"Yes, everything, only related to her, will be investigated." I nodded and said in a deep voice.

"Huh?" Xiao Xuan grinned, and the muscles on his face twitched.

"Focus on investigating the person's living habits, especially her IP address, to see if she has browsed any foreign websites, made some remarks, or had some music-related things." Li Meng on the side opened his mouth and explained.

"Oh, then I understand, it's still my sister-in-law who speaks reliably." Xiao Xuan blurted out subconsciously.

"Ah, the noodles are quite reliable, and I will invite you to eat them next time." I hurriedly stepped forward and covered Xiao Xuan's mouth, and quickly covered up this somewhat embarrassing title.

Xiao Xuan also reacted immediately: "The noodles in that noodle restaurant are very delicious, very reliable, hehehe." ”

Li Meng stood behind us, frowning, looking up and down at the two of us, and didn't say anything more.

"That, you hurry up and focus on checking Zhang Yajing's IP address." I patted him on the shoulder and said seriously: "This clue is very important, whether you can solve the case or not depends on you." ”

After listening to me, a sense of responsibility arose, Xiao Xuan straightened his waist in an instant, and began to open the computer to operate: "Don't worry, I'll hack into her social account first to see if there are any clues in it." ”

"Okay, then I'll wait for your news, be sure to hurry." I nodded, and let out a serious voice.

All of us think that Zhang Yajing is the murderer, but it is indeed an undocumented crime.

Xiao Xuan is a well-deserved hacker, otherwise Shen Ruoshan would not have taken the initiative to apply for a not guilty defense for him after he was caught, and after compensating for the loss, he was ordered to the Ningzhou City Public Security Bureau.

A few hours later, Xiao Xuan really found an important clue in this case.

Zhang Yajing once posted a long post on Tieba five years ago, when she was twenty-three years old.

The content of the post is extremely dark, with several references to death.

The cause was that her parents died in a car accident, and her spirit was very badly damaged, and she was suicidal at one point.

At the end of the post, there is a long paragraph of lyrics, after Xiaoxuan's comparison, this lyrics are the Chinese lyrics of "Black Sunday" circulating on the Internet at that time:

[The world is coming to an end, and hope is meaningless.

Cities are being bulldozed, and fragments of shells make music.

The grass was stained red with human blood, and the streets were littered with dead people.

I will pray again, people are sinners.

God, people are all wrong......

The world is over! 】

There were many replies to this post, most of which encouraged her to be brave in life, as well as some other advertising posts.

"It seems that she was exposed to this death song five years ago......"