Lin Dongxue hurriedly asked: "Where is she?"
"Just where we have been."
Lin Dongxue thought for a while, and suddenly realized, "I seem to understand that Xiao Qin disappeared on the evening of August 3rd. On August 4th, Zhang Xiao's "killing workshop" was accidentally discovered by a neighbor and reported to the police. It is impossible for him to know the prophet, which means that he does not need to prepare another hiding place. It is more than enough to kill two people in one place. Xiao Qin was in the previous community."
Xu Xiaodong said: "But we have been to the scene several times, and there are no other victims. Didn't the one who was dismembered say that it has been dead for several days?"
Chen Shi said: "Do you remember that the living room was full of newspapers, but it was very clean. I think it was intended to kill Xiao Qin. Because it was accidentally discovered, the suspect had to take her to transfer and leave the scene. ."
Lin Dongxue said: "We have watched the surveillance video over and over again, and the community has been visited many times. If there are suspicious people coming in and out, we should not miss it."
"Let's check it out again!"
The three drove to the community where there was a call to the police for the first time and returned to the scene of the crime. Chen Shi recalled the situation that day, saying: "The unit building was overcrowded that day. Later, the police also came. The murderer took Xiao Qin and it was difficult to leave. Go out, did they go upstairs?"
"Or... They rented another hiding place in this building." Lin Dongxue said.
Chen Shi pondered and said, "Xiaodong, you go and call the property."
Xu Xiaodong found the property, and the property had a list of the owners, which showed that the owners did not live here and the houses were rented to outsiders. Several people knocked on the door one by one, and they were very nervous every time they knocked on each door.
It turns out that the tenants in this building are not suspicious.
Finally they came to the top floor. Chen Shi pointed to the chain-linked rooftop door and asked the property: "Can I go to other units from the rooftop?"
The property said: "The upper part is indeed open, but the roof doors on each floor are locked from the inside. Like this door, it cannot be opened from the outside."
"Do you have the key?"
"have!"
"Open."
Several people opened the roof door and came to the roof. There are many air-conditioning ventilators and solar water heaters on the roof. In addition, there are several drum-shaped water tanks. Chen Shi walked to the side of the water tank and climbed up the ladder. Said: "No, how could there be people hiding in the water tank, and it's still locked!"
"What's the smell?" Lin Dongxue sniffed around.
Smell it carefully, there was a strange smell in the air, which came out from the cracks in the water tank. It was not a bad smell, but more like a chemical smell.
Chen Shi felt a little dizzy, and suddenly said, "Get out quickly, this smell may be poisonous!"
Everyone hurried to the upper air vent. Chen Shixin thought about the danger. There was a slight bitter almond in the smell just now, most likely it was cyanide. Looking at the locked water tank, he thought there must be something in it.
"Call Lao Peng!" Chen Shi said.
After a while, several police cars drove in. Peng Sijue sent several technical police officers to the rooftop in protective suits and opened the water tank. Then a voice from the scene came from the radio: "Captain Peng, there is a dead body in the water tank. ."
"What!?" Lin Dongxue was shocked.
"Describe it." Peng Sijue said.
"One man and one woman, the woman is underneath, the man is on top, and they are all soaked in waist-deep water... The color of the corpse seems to be poisoned, the smell inside is so strong, you can smell it through the gas mask. ."
"Be careful, don't touch the water inside, keep ventilation, and let the smell dissipate first."
Three hours later, the body was retrieved and laid on the rooftop. Surprisingly, one was Xiao Qin, and the other was Zhang Xiao, the suspect that the police had been looking for.
The poison in the water should be hydrocyanic acid, which is a highly toxic gas produced by the reaction of hydrochloric acid and cyanide. It will be fatal if you inhale a small mouthful. The structure of the water tank is sealed. Even so, Chen Shi just smelled it through the water tank. Still feel a little dizzy.
Peng Sijue said anxiously: "You are really dead, do you want to go to the hospital for an examination?"
Chen Shi waved his hand, "It's okay, I'm going to die early. At most, this dose is just eating too much almonds, and it won't get in the way."
The two checked the corpses. The signs of death of the two were very close. They should have died at the same time. The time of death can be guessed. It must be around the evening of August 4.
Xiao Qin's clothes were thin, and his hands and feet were tightly bound by nylon ropes, causing his hands and feet to change color.
The policeman who found the body stated that Xiao Qin fell face-up to the bottom of the water at the time, and Zhang Xiao was pressing on her sideways. His arm was pressed down by Xiao Qin's body, and it seemed that he fell together.
When Zhang Xiao's body was turned over for inspection, there was no trauma to his back, and it was impossible to see if it was pushed.
Chen Shi looked at the corpse and asked, "Does Zhang Xiao smoke?"
Peng Sijue said: "Maybe smoking. A lot of cigarette butts were found at the corpse site below. He should have smoked it."
Chen Shi speculated: "Then he should have a bad sense of smell. Hydrocyanic acid has a slight bitter almond smell, but many people can't smell it. Inhaling it is instantly fatal. I think the murderer poured cyanide into the bucket in advance. With the acid and the lid closed, Zhang Xiao originally planned to dispose of Xiao Qin. When he opened the lid, he inhaled the deadly gas and fell down with Xiao Qin."
Lin Dongxue said: "But when we came, the water tank was locked."
"Yes? Lao Peng, is the diffusion rate of hydrocyanic acid fast?"
"This gas is lighter than air, and it diffuses relatively quickly."
"About how long will it take to diffuse the light?"
"It has to be tested."
"It seems that the murderer locked the water tank before the hydrocyanic acid was completely diffused. He must be wearing a gas mask and lying nearby... By the way, it is very likely that he asked Zhang Xiao to come here to deal with Xiao Qin beforehand. A deadly trap was laid. This person was Zhang Xiao's accomplice. He came to a perfect unscrambling to kill the donkey. He killed Zhang Xiao without showing a trace, and then transferred the money away."
Lin Dongxue said: "I suspect that he was responsible for the clogging of the sewers. The purpose is to force Zhang Xiao to run away and lose his ability to judge."
Chen Shi nodded, "This guy is really smart. If we hadn't found the body in the water tank, we might have been looking for Zhang Xiao everywhere, thinking he had run away. Now that Zhang Xiao is dead and the clue is broken, he took it. Hiding safely with the money."
Xu Xiaodong said: "Didn't the bank surveillance photograph this and withdraw money from the ATM machine?"
Lin Dongxue said: "The surveillance didn't capture the face at all. It's too difficult to catch people by this... Alas, the clue broke after a round of investigation. It's too bad!"