Qin Jinjun burst out laughing because of Lan Jingguo's words, Detective Tang looked at her with the eyes of a madman, and Lan Jingguo frowned slightly.

After a while she stopped laughing, raised her hand to wipe away the tears from laughter, and said, "Do you think people like me will be killed by small citizens?" Don't tease me, okay? I'm almost out laughing. ”

"Please answer my question carefully." Lan Jingguo's face did not change and continued to ask.

Qin Jinjun leaned back slowly, leaned back on the sofa, and adjusted to a sitting position that she thought was comfortable before she replied: "I usually don't pay attention to the people around me at all, because they are meaningless to me, let alone suspicious people, even if a celebrity passes by me, I won't notice." ”

"But I don't think so, I think you're an observant and can observe a lot of details that ordinary people and even the police overlook. And your mind is very quick, and you can sort out a clear line in your mind in a very short time. I can't tell you what you are like on a regular basis, but at least you can give me that impression in the news video. Lan Jingguo took a sip of tea after speaking, and stared at Qin Jinjun with a calm gaze.

"For the sake of what you said, I'll tell you what I think about this case." Qin Jinjun stretched out his slender index finger and pointed at the photo of Ms. Zhu's corpse and asked, "Before I say my opinion, I want to ask you a few questions, please answer them truthfully." ”

Qin Jinjun learned Lan Jingguo's tone and spoke, which made Detective Tang extremely unhappy, she glared at Qin Jinjun angrily, and said coldly: "We are here to check whether you are currently in danger, and to understand your situation so that we can send people to protect you, not to play detective games with you, please don't delay our work." ”

Qin Jinjun pointed at the Tang criminal policeman, then looked at Lan Jingguo, the corners of his mouth slowly turned up, and asked with a smile: "How can you teach a subordinate who doesn't understand the rules so much?" ”

Lan Jingguo turned his head and glared at Detective Tang, and said lightly: "Just be in charge of the record, don't talk too much." ”

Criminal Police Tang was a little aggrieved, but he listened to Lan Jingguo's words very much, and obediently lowered his head and continued to record.

"First of all, I want to ask why this Ms. Zhu can be outside? Depending on the amount of money involved in the fraud case, a sentence of three years or more should be imposed on the case. Qin Jinjun asked.

"She turned herself in, and she was willing to make restitution, and she was not the mastermind, so the judge gave her a light sentence and was released after only three days of detention." Lan Jingguo replied.

Qin Jinjun frowned, but he didn't continue to dwell on this issue, and continued to ask: "Briefly explain who and when the body was found, as well as the time of her death and the cause of death." ”

"The body was found by a young man who lived on the fifth floor of the residential building where the murder occurred, he worked as a cashier at a convenience store near the residential building, and after changing shifts with another cashier, he bought a cup of noodles from the store to eat at home, and walked to the corner of the stairs between the second and third floors to find the deceased at about 6:12 p.m. on September 13, 2013. According to the autopsy report from the medical examiner, the deceased died at about 1 p.m. on the same day, and the cause of death was severe brain stem hemorrhage caused by a severe blow to the back of the head, and his heartbeat and breathing almost immediately stopped. "The visit was only to determine whether Qin Jinjun's life was threatened, so Lan Jingguo did not bring a detailed autopsy report, and could only dictate what he remembered.

"Have you asked residents living on the second and third floors and pedestrians on the streets near the residential buildings? Did they hear any unusual shouts at noon? Have you seen suspicious people entering or leaving the building? Qin Jinjun asked again.

"We asked all the residents on the second and third floors, they were all elderly people in their sixties and seventies, and when the deceased was pushed downstairs, they almost all went back to their rooms for a lunch break, and even if there was any movement, they could not hear it; There was an old lady on the second floor who didn't have the habit of taking a nap, but she was deaf two years ago. Further up, except for some young office workers living on the fourth and fifth floors, the sixth and top floors are vacant houses. Lan Jingguo replied.

"Office workers go out early and return late, and they are definitely not at home at noon, and you will definitely not be able to ask anything." Qin Jinjun touched his chin and said.

Lan Jingguo nodded helplessly.

Qin Jinjun fell into a moment of contemplation, then the corner of his right mouth turned up, and he said with a smile: "The modus operandi is very simple, but it is very cleverly planned, taking into account almost all the factors of the environment of the murder scene, which can be said to be close to perfection." ”

Lan Jingguo looked at Qin Jinjun curiously, quietly waiting for what she was going to say next.

Qin Jinjun picked up the cup and drank a sip of lemon tea to moisten his throat, and began to tell his opinion: "The murderer is very thoughtful, I deduce that the murderer has visited the residential building where the deceased lived many times, and the murderer may also get the contact information of the person who rented the house in this building from the real estate agent, inquire about the details of the house from him, and understand the information and daily life of the residents of this building, so as to choose the appropriate time and place to commit the crime." ”

Speaking of this, Qin Jinjun pondered for a moment, pointed to the photo and continued: "Judging from the photos, this design style of floor tiles was very popular in the eighties and nineties, durable and cheap, mostly used to decorate the stairwells of residential buildings, from which it can be inferred that the deceased rented an old house built twenty or thirty years ago, and can only go up and down the stairs on various floors, so it also shows that the stairwell of this building is not installed with monitoring, so what happened inside the residential building?" There is no way to know. The murderer took advantage of this, cooperated with the set time and floor of the crime, and hid in the blind spot at the corner of the stairs, waiting for the opportunity to carry out the murder plan on the deceased. ”

"Then how can the murderer be sure that the deceased will return home within the planned time? If the deceased had not reached the staircase between the second and third floors within the set time for the crime, wouldn't the plan have come to naught? Detective Tang was attracted by Qin Jinjun's words, stopped the pen in his hand and couldn't help but ask.

"You're on the point, and that's the subtlety of the murderer's plan." Speaking of this, Qin Jinjun showed a smug smile, deliberately picked up the cup and drank lemon tea, hung the appetite of the two, and continued after moistening his throat: "The deceased may not have died on the thirteenth, maybe he died earlier, or he may die a few days later. ”

"What do you mean? I didn't understand? Criminal Police Tang hurriedly asked.

Lan Jingguo's face was a little surprised, his eyes widened slightly, and he said, "You mean that the deceased has seen the murderer, and more than once!" ”

Qin Jinjun applauded Lan Jingguo's affirmation, and then said: "I said before that the murderer must have visited the residential building where the deceased lived many times, but I didn't say that he went when the deceased couldn't see him/her. From the day Ms. Zhu was released from prison and returned home, the murderer came to the stairs between the second and third floors of this residential building every day and quietly observed. After many times, I groped for the daily life of the residents of this building, picked out the time when the staircase was least crowded, and waited at the corner of the stairs during this period, passing by the deceased every day. Until the best time came, the murderer did not hesitate to push Ms. Zhu, who passed by him, down the stairs. ”

But the murderer came to the building every day, and even if the old occupants rarely moved, it was impossible for them not to notice that there was such a stranger in the stairwell. Besides, the deceased brushes shoulders with the murderer every day, isn't there any suspicion? The most important point is that this case has been characterized as a purposeful vendetta murder case, and the murderer is very likely to be the family of the victim in the fraud case or someone related to the victim, and the deceased may have been in contact with the murderer before, so your inference does not make sense at all! Detective Tang denied Qin Jinjun.

Lan Jingguo on the side frowned, his head lowered slightly, and he seemed to be in deep thought.

"The tea is cold, I'll ask someone to change the pot for you." The corners of Qin Jinjun's mouth rose, and he began to change the topic again, losing the appetite of the two of them, and made Tang Criminal Police so anxious that he didn't need to.

"Your reasoning is interesting, can you go on with it?" Lan Jingguo finally spoke.

Qin Jinjun stretched out again, lay on his side on the sofa in a lazy and comfortable position, and drank the lemon tea in his hand calmly. After three or four minutes, she thought that she had whetted the appetite of the two of them, so she put down the lemon tea and said, "I don't like people to deny me before I finish speaking, if you want to listen to it, just shut my mouth up." ”

Detective Tang's face flushed slightly, and he looked down at the notepad and was silent.

Qin Jinjun glanced at Detective Tang, seemed to be very satisfied with her performance, and continued: "It may have been in contact with the murderer, in other words, it may not have been in contact with the murderer, and judging from the results, if the deceased can recognize the murderer, he will not end up in this fate." This also confirms what I said before, that the murderer is hiding in the blind spot at the corner of the stairs. Visual blind spots do not necessarily refer to places that are invisible to the human eye, but may also be people or objects that are not often noticed. Humans are very self-conscious creatures, and they usually don't pay attention to things that they don't pay attention to, and naturally they don't become wary. When this unnoticed person suddenly attacks the person passing by, the person can only wait for death defenselessly. ”

"Do you mean that the murderer is a person who is frequently present at the scene of a murder without arousing suspicion from the occupants, and that his/her presence is justified in the eyes of the occupants as well as the deceased?" Lan Jingguo asked.

"Well, that's pretty much it." Qin Jinjun nodded.

"And who is the murderer?" Detective Tang was suddenly fascinated and asked.

But in exchange, Qin Jinjun sneered for a while: "How do I know? I haven't seen your suspect, and I haven't gone to the field, but I've done my best to draw this inference based on the information and photos you gave me, so be content, and the rest will be your turn to investigate. ”

Detective Tang was said by Qin Jinjun's face was blue and white.

"Would you like to investigate this case with us? First, it can help us catch the murderer as soon as possible, and second, it can also protect your safety very well. Lan Jingguo sincerely invited Qin Jinjun to participate in the investigation of the case.

"What do I get by helping you investigate?" Qin Jinjun asked.

"Bonuses and certificates of honor from the government." Lan Jingguo replied.

"Do you think I'm short of money?" Qin Jinjun asked rhetorically.

"Thank you for your cooperation, let's go first." Lan Jingguo got up, put away the photos on the table and prepared to leave.

"Come home tonight to say hello to Lan Zhaoyu for me, and then bring her a word, you really look like your father, and your personality is similar, both are a stuffy gourd." Qin Jinjun said with a smile.