According to the portrait of the suspect given by Gu Li, Zhou Changqing conducted a carpet search around a five-kilometer radius of the old city, and finally locked on three suspects, Zhang Tao, Li Qing and Sun Qiang. The police force split up and soon mastered the identity information of the three people.

Zhang Tao, 29 years old, engaged in wedding photography, now lives at No. 326 South in the Old Town, broke up with his girlfriend at the end of last month, likes to wear black-framed glasses, has a stable job, has a cheerful personality, and is very talkative. Almost every one of his characteristics matches Gu Li's portrait.

Li Qing, 32 years old, freelance, opened his own art gallery a few years ago, loves literature and art, now lives at No. 829 Central Street in the old city, short hair, wears glasses, has recently been in and out of the small commodity market and building materials market, purchased a large number of decorative supplies and wood paint.

Sun Qiang, 30 years old, music teacher, handsome, now lives at No. 658 North Street in the old city, it is understood that this person has a gentle and polite personality on weekdays, and the relationship between neighbors gets along well. Only once did he behave very uncharacteristically, scolding the neighbor next door who came to borrow something.

Afterwards, he came to apologize, saying that he had encountered some troubles and was in a bad mood, so he lost his temper with the other party. His apology was sincere, and his neighbors were understanding, and he forgot about it for a long time, and he didn't remember it until the police came to investigate.

Almost every one of the three suspects has a portrait of Gu Li, especially the person named Li Qing, who has recently been in and out of the market and bought a lot of things for the scene, which can't help but remind people of the scene construction of the crime scene.

So, Zhou Changqing focused on investigating the suspect. It's just that I followed him for two days in a row, but I didn't find anything suspicious. He had to turn his gaze to the other two suspects again.

But no matter which suspect it is, it seems to be normal and there is no abnormal behavior, so he has no way of confirming who the murderer is.

No, he could only communicate with Gu Li by email through Chang An and Gu Li, and after explaining the existing situation to him, he sent the information of the three suspects over.

Gu Li just glanced at it roughly, and then simply replied with two words: "Sun Qiang." ”

Zhou Changqing didn't have time to ask why, so he rushed to the downstairs of the community where Sun Qiang lived with a few colleagues, which is a community in the area that is old and looks a little dilapidated.

At that time, it was already dark, and it was also the time of meal, and the lights of thousands of homes were lit. He tilted his head and looked at the fourth-floor window, the dark curtains blocking the window so tightly that not even a trace of light could penetrate from it.

Contrasting the surrounding lights makes the darkness look different. There is Sun Qiang's residence, but at the moment, he has no way of knowing whether Sun Qiang is at home.

Zhou Changqing went upstairs and knocked lightly on the door, but no one responded. He lay in the doorway and listened with bated breath, but there was no movement inside, and there was no light in the crack of the door.

Not at home? Zhou Changqing knocked on the door of the next door instead.

"Who?" a female voice sounded in the room, and then the footsteps inside were heard, getting closer and closer.

"Census. Zhou Changqing lied casually, in case Sun Qiang didn't go out, but was in the house, if he rashly revealed his identity, it would make the other party alert, and as a last resort, he had to pretend for a while.

The door quickly opened, and a middle-aged woman stepped out of the house. After Zhou Changqing asked a few questions casually, he began to listen to Sun Qiang's news, and he asked, "Excuse me, have you seen the household next door?"

"I just went out not long ago, my man was on night duty today, and he forgot to bring the key when he went downstairs, and when I gave him the key, I happened to see him go out, in a hurry. The middle-aged woman replied truthfully.

Zhou Changqing's mind suddenly popped up what Gu Li said, the murderer will commit murder again within five days, so ...... Is it today?

He said no, turned and went downstairs. I began to remember something in my head, then I took out the map, circled a few dots, and muttered to myself: "Studio, cinema or amusement park...... Where could it be?"

Thoughts were surging in his mind, and finally two words "vacant" popped up, he smiled, and ran to ask the uncle who was walking downstairs.

The old man told him that most of the places in the old town that had been vacant or abandoned in the early years had been taken down, renovated and renovated, and started a business.

Except for a time theater, a studio, a museum, and the rest is the bigfoot playground, which is relatively remote in location, so it has been abandoned to this day.

"Bigfoot ......"

After Zhou Changqing determined the location, he quickly set off and went to the address of the playground. Sure enough, at the merry-go-round, he found Sun Qiang's figure, and a woman was tied to it.

Zhou Changqing didn't dare to rush forward to arrest him, so he began to make a plan. There were a total of 6 policemen who went to Sun Qiang's residence, and he was simply divided into an attack group, a rescue team, and a logistics team.

As the name suggests, the attack team is responsible for infiltrating the scene and arresting the criminal, the rescue team is responsible for rescuing the victim, and the logistics team is responsible for keeping an eye on the situation, assigning actions according to the situation, or preventing the suspect from escaping, or entering the scene to assist. He was responsible for distracting Sun Qiang.

Everyone looked at the table, and at 20:30, the rescue operation began.

The attack team and the rescue team bypassed the bushes and quietly approached, and the whole process, the movements were very light, so that people could not notice the abnormality.

After the attack team and the rescue team were in place, Zhou Changqing deliberately made some noises to make Sun Qiang vigilant, and when he was distracted to investigate the situation, Zhou Changqing waved his hand, and the police of the attack group jumped up.

Sun Qiang was knocked to the ground by the sudden intruder, and he was caught off guard and fell heavily to the ground. Before he could get up from the ground, he was already subdued by the police.

The rescue team immediately ran to the victim and untied her rope. At that time, she was unconscious.

Zhou Changqing walked in front of Sun Qiang and walked straight to the victim, looking at her eyes closed, he couldn't help but move in his heart, and slowly raised a trace of nervousness, she ...... Are you still alive?

He stretched out his hand, his fingertips against her mouth and nose, fortunately, he could still feel his breathing, and a big stone in his heart fell to the ground, and his expression was a lot relieved.

He then asked the officers of the logistics team to take the victim to the hospital for a full body examination to ensure the safety of the person.

Sun Qiang had been subdued, and Zhou Changqing approached him, staring at him intently, with short hair, a delicate and handsome face, and a pair of black-framed glasses, looking easy-going and not very aggressive.

But under such a harmless appearance, there was a dark heart hidden, and Zhou Changqing suddenly had the urge to shoot him. So many innocent lives died in his hands......

Zhou Changqing took a deep breath, reason allowed him to control his thoughts, he took a few steps back, shook his hand, and said in an indifferent tone: "Take him away!"

After going back, Zhou Changqing called the logistics team, fortunately, although the victim was poured sleeping pills, fortunately they arrived in time, and the dose of sleeping pills was not fatal. By now, the doctor had washed her stomach.

According to the results of the examination, she was not visibly injured except for a slight shock, and there were no major problems.

Zhou Changqing interrogated Sun Qiang overnight, and when he came out of the interrogation room, it was already early the next morning. The murderer was brought to justice, he couldn't help but be overjoyed, took out his mobile phone, and dialed Chang'an's phone.

At that time, Chang An was eating breakfast in the school cafeteria, and as soon as he sat down with a plate, his mobile phone rang.

Chang An picked it up, and before the other party could speak, he asked: "Have you caught the murderer?"

"How do you know?" Zhou Changqing was first startled, and then excited: "When he was about to commit the fourth case, we caught him red-handed.

After an overnight interrogation, he confessed to the crime he had committed. This time, thanks to you and Professor Gu......"

"That's all the work of the gods, and I will convey your gratitude for you. ”

After hanging up the phone, Chang An seemed to be in a good mood, walked out of the cafeteria with a smile, and sent an email to Gu Li: "The murderer has been found, thank you for your help." Lin Changan. ”