In the middle of the night, the nursing home was silent.
Su Yang came here twice in one night.
However, the first time, he was in Old Wu's room. The second time, he was outside Old Wu's room.
Su Yang actually had a very complete murder scene in his mind. That was, would the murderer be standing outside the window like him and gently knocking on the door and window to wake Old Wu up?
Or perhaps, he had imitated something terrifying?
However, how the murderer killed at that time was only used to find clues.
Su Yang stood outside and looked around.
There was a wall around the nursing home. Fifteen meters to the left of Old Wu's room was an iron gate.
Su Yang thought for a moment. He shone his flashlight and began to walk toward the iron door.
Although he couldn't be so careful at night, Su Yang didn't think so about the murderer killing people in the nursing home.
After climbing over the wall, Su Yang looked into the distance. On one side of the road was a nursing home, and on the other side were shops and residential houses.
Su Yang looked around. This was not a suitable place to kill.
Moreover, there were cameras installed on both sides of the road, whether it was residential houses or utility poles.
In Wu Qi's investigation records, there was an investigation of the surveillance cameras. However, there were fewer surveillance cameras in the nursing home. After the investigation, there were no suspicious people.
There were also no suspicious figures in the surveillance cameras of the houses and the roads opposite.
Su Yang stood on the road and thought to himself,""Wait, the murderer still has to act inside the nursing home. As long as they leave this wall, they will be surrounded by the surveillance of the Heavenly Network. According to the distribution of the surveillance cameras in the nursing home, if they were to make a move outside the window, the best way to leave was to squat down and go around to the back door of the courtyard. There were no surveillance cameras outside the back door, so they could leave in the dark without being noticed.”
"In other words, the murderer's movement space was always outside Old Wu's window and the distance to the back door!”
Just as Su Yang was thinking about it, his phone suddenly rang.
The call was from Jiang Rou, probably to report the cause of Wu Qi's death.
"Hello, Team Leader, the cause of Captain Wu's death has been investigated. He died of multiple toxic chemical poisoning. The murderer had placed a certain amount of chemical poison in the teacup he drank from, causing him to be poisoned to death.”Jiang Rou replied.
"A chemical agent? It had been less than a minute since Captain Wu drank the water and found him dead. During this period of time, other than his face being a little red, there was nothing wrong with him. What kind of chemical agent was so ruthless that it took a life in such a short period of time?”Su Yang asked.
"Officer Wang said that Captain Wu had drunk a lot before he went to the municipal bureau. On the way here, Officer Wang and the others noticed that Captain Wu didn't seem right. However, Captain Wu said that he was fine, so he didn't think too much.”
"Have you found out where Captain Wu's teacups are?" Su Yang asked.”
"He has used that teacup for many years, and before that, someone from Captain Wu left, probably to eat something.”
"Okay, get Zhang Xing to check where Captain Wu has been now. Then, get the surrounding surveillance cameras of those places to see if anyone has placed anything.”
Su Yang was about to hang up after giving his instructions, but Jiang Rou hurriedly called out,"Wait a minute, Team Leader. There's another important clue. Captain Wu's body was examined by Teacher Chen. I was busy examining Old Wu's corpse with Teacher Li Changkuan just now. I detected something strange under his fingernails. It was very subtle, almost negligible.”
"What is it?"
"The dirt under the fingernails, but there are sulfur compounds in the dirt. Old Wu's fingernails were not very clean, and they were very long. It should be because no one had trimmed them for a long time. The previous task force had also tested the dirt under the nails. Teacher Li Changkuan's autopsy report also mentioned sulfur compounds. I asked Teacher Li why he didn't investigate the source of the sulfur. Teacher Li said that the sulfur was caused by Old Wu using the sewage sludge to clean the vegetable garden.”
"There's a sewer well in the backyard of the nursing home. Half a year ago, a factory secretly discharged sulfur. After it was reported to stop, because of the protests of the elderly, the sewer was directly abandoned and no longer used. Later, after the old people had repeatedly asked the hospital, the nursing home finally hired some people to clean the sewers half a month ago. At that time, Old Mr. Wu said that the silt in the sewers was fertile and asked for some to fertilize the small vegetable garden that he and a few other old people had opened.”
The sludge in the sewers was not actually fertilizer, especially for vegetables. However, the old people did not know that much. Old Wu might not know enough about science, so he used sludge as fertilizer. Moreover, he tended to it every day, which led to the existence of residual sludge under his nails!
There was nothing wrong with Li Changkuan's explanation. Even if Su Yang had not deduced how the murderer killed him, he might not have regarded the mud that existed for a reason as a suspect!
But at this moment, the meaning of this clue was completely different!
Jiang Rou directly said his thoughts,"Team Leader, before you left the Municipal Public Security Bureau, you told me not to let go of any details. You also told me how the murderer might have killed. Do you think the murderer transferred Old Wu to the sewer to kill him and then transported the headless body back?”
"There's no need to doubt it. There's no other possibility. There were no surveillance cameras in the backyard of the nursing home. There were no surveillance cameras on the road from Old Wu's room to that place. That was where the murderer went!”Su Yang said confidently as he walked towards the well.
Jiang Rou's face revealed a hint of anticipation."Is it possible that the other end is still in the sewers? Maybe the murderer is playing mind games with us?”
"That's impossible. If the murderer was only playing mind games, there was no need to kill Wu Qi. There were two types of killing. One was for a reason, and the other was for an excuse to kill! The case was getting closer and closer to the second possibility. Jiang Rou had preserved the sulfur. If the murder was in the sewers, then their traces would be revealed immediately!”
"Alright, let's not talk about it anymore. I'm already at the sewer well! You'd better bring your tools to the nursing home. The murderer can keep Old Wu's room without leaving any traces, but he definitely can't go into the complicated sewers without leaving any traces!”
Su Yang held his phone and stared at the manhole cover!
This book comes from：m.funovel.com。