Let's go back to November 20th, to the conference room of the Anding Division.
Seeing Ma Jie's red and swollen eyes, Yang Bairong joked, "Young man, you need to take care of your health!"
Ma Jie's red and swollen eyes were glistening with tears. "Brother Yang, don't talk about Brother Yang, we're both single. Do you think everyone is as lucky as Captain Li? I've seen him drinking herbal tea lately! Your wife is amazing!"
"Cough cough..." Qin Wen, who was outside the door, couldn't stand it anymore and pushed the door open to come in. "Xiao Ma, you should find a girlfriend."
Li Na, standing behind him, covered her face and laughed incessantly.
"Everyone's here pretty early!" Li Nan followed closely behind and stepped through the gate.
Ma Jie silently lamented that Li probably hadn't heard his earlier teasing.
"Thank you all for your hard work. I even called you all to work overtime on Saturday!"
"All violations will be investigated, and all murder cases will be solved!" The crowd, scattered and dispersing, still chanted the slogan as usual.
"Alright, alright, I know you're putting up a silent protest. I'll treat you all to a big meal at noon!"
"Is it going to be another awful fast food meal?" Li Na muttered to herself.
Qin Wen whispered in her ear, "Don't worry, I'll add an extra chicken tongue for you."
"Alright, let's get back to the main topic. Thanks to everyone's efforts, we've made a major breakthrough in the 1117 case. At least we can now confirm that Liu Xiangdong is the murderer of Li Yan."
"But we still cannot let our guard down. All violations must be investigated and all murder cases must be solved. Today, we will focus on discussing this case of sudden death at a construction site."
Li Nan shared the results of her discussions with Qin Wen from the previous few days with the others, including several points of contention, such as the "water of life," dry ice, and sodium hypochlorite.
"This is definitely a high-IQ crime!" Yang Bairong exclaimed. "These murderers are getting more and more formidable these days!"
"It's all the fault of TV novels!"
"Xiao Ma, tell me your surveillance results first!" Li Nan glanced at Ma Jie and said in surprise, "Xiao Ma, take care of yourself!"
Ma Jie had nowhere to vent his grievances, so he could only numb himself temporarily with work.
According to Ma Jie's investigation, Wang Zihe rented a cheap room near the Sifang construction site. The room did not include water or electricity, nor did it have WiFi or a private toilet. It cost only 300 yuan a month.
Calling it a rental is a bit of an overstatement; it's really just a temporary container house set up for construction workers to rent.
Wang Zihe's residence is only a ten-minute walk from the Sifang construction site. Because it is a newly built project, the surrounding facilities are not very complete, especially the traffic cameras.
According to the road surveillance footage provided by the traffic management department, there were a total of 13 surveillance cameras on the route Wang Zihe took to work on the 18th, and 7 of them captured Wang Zihe.
The surveillance video gradually revealed Wang Zihe's movements.
(1) At 07:47 on the 18th, he walked out of the rental house area;
(2) At 07:51, passed by the bus stop;
...
(7) At 07:58, I clocked in and entered the construction site.
Although there were no cameras on some sections of the road, or no cameras captured Wang Zihe, based on the analysis of his route and speed, it is clear that he walked from his rented house to the construction site at a normal walking speed, with an error of no more than one minute.
Throughout the entire process, Wang Zihe carried his blue thermos cup. However, when he passed a bus stop (surveillance footage 2), he had a face-to-face confrontation with a mysterious man for twelve seconds. When they separated, he switched the thermos cup from his left hand to his right.
The construction site has a comprehensive surveillance system. From 7:59 a.m. when Wang Zihe entered the security room until the incident and when the surrounding migrant workers called the police, everything was recorded clearly.
Simply watching this video doesn't yield much useful information. It only proves that Wang Zihe did walk from his rented apartment to the construction site alone on the day of the incident, carrying a thermos. At most, there's one suspicious point: the man at the bus stop who appeared for 12 seconds.
After listening to Ma Jie's report, Li Nan said:
"Yesterday, Li Na confirmed with witnesses at the construction site that the thermos should belong to Wang Zihe, as the color and style are at least the same. However, after careful comparison, Qin Wen discovered that the thermos has been deliberately worn and aged. In other words, this thermos does not belong to Wang Zihe!"
Everyone fell into thought, and Li Nan continued his presentation.
"Yesterday, Qin Wen already verified through experiments that this edible capsule's tolerance to alcohol is about one hour. Wrapping it in dry ice reduces the effective time by half. In other words, before the capsule dissolves, the dry ice is released slowly, gradually lowering the temperature, making it difficult for the human body to perceive the temperature change. Once the capsule breaks, a large amount of dry ice is released, and the water glass will cool down rapidly. Even if Wang Zihe is stupid, he would notice something was wrong with the glass if his hand got frozen!"
"The surveillance footage just now clearly shows that Wang Zihe brought this thermos cup from home to the construction site. Apart from a 12-second stop at the bus stop, there was nothing suspicious about it."
"So here's the question: where did the murderer drop the thermos? And why didn't Wang Zihe realize that he wasn't drinking from his own cup? Could it be that man at the bus stop?"
"Captain Li, I've made another discovery!" Ma Jie's swollen eyes looked particularly watery, as if he desperately wanted to be praised.
“I also think that the man at the bus stop was suspicious, so yesterday I not only watched the traffic management department’s surveillance footage, but also went to the bus company to get the onboard surveillance footage of those buses at the time of the incident.”
Li Nan looked at Ma Jie with satisfaction and gave him an exaggerated thumbs-up gesture.
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