I wiped my beard and thought to myself: natural gas poisoning is different from carbon monoxide poisoning, and the so-called natural gas poisoning should not be called poisoning, because natural gas, a methane-based gas, is not lethal, and it is fatal because it suffocates or explodes after leaking in a confined space.

I went back to the living room, which was less than fifteen square meters, and it was easier to suffocate people by natural gas. I turned the whole house around, and the two-bedroom, one-living room, one-kitchen and one-bathroom house was about 60 square meters. Connected to the living room are three doors, a door to the kitchen and a door to the two bedrooms, and the doors are intact. The living room does not have a balcony, the balcony is in the master bedroom, so the living room only has a three-bay sliding window, which can also be opened and closed freely.

In this way, it is easy to turn this living room of less than 15 square meters into a confined space, as long as the windows and three doors are closed. It is only under such confined conditions that leaking natural gas can suffocate to death.

So how do you introduce natural gas into this confined space? Obviously, gas must be introduced into this confined space through pipelines.

Thinking of this, I seemed to have a clue and hurriedly returned to the kitchen. Lao Lu knew that I was thinking, so he didn't ask questions, and followed me silently.

I started to check the gas stove, because the gas supply port of the natural gas is in the gas stove, so to draw the gas from here, the gas stove had to be disassembled. However, judging from the oil stains and dust accumulation of the gas stove, the gas stove is intact, so it is not established to draw natural gas from here.

So where else can gas be drawn? It's good to imagine that the average home water heater uses natural gas.

I hurriedly walked to the bathroom, and fortunately, it was the gas water heater hanging outside the bathroom, and I proved my judgment right at first glance. Because there are obvious new traces of disassembly and assembly at the natural gas interface of the gas water heater, this kind of disassembly and assembly traces cannot be concealed.

I breathed a sigh of relief, turned to Lao Lu and said, "I understand the method of killing, and now we urgently need to find out who the murderer is?" What was his motive for committing the crime? I have something to ask about the other victim. ”

Lao Lu nodded and said, "Okay, I'll drive you over." ”

So Lao Lu gave his subordinates instructions on the test of wine stains and the investigation of some cases, and then drove me and Tang Zhenguo to the central hospital.

In the car, Tang Zhenguo sat in the back seat and suddenly patted me on the shoulder and said, "Ouyang, you turned out to be a policeman!" ”

Lao Lu Haha smiled and said: "Comrade bodyguard, it seems that you don't know your employer at all, he is not a policeman, but he is a good helper of the police, I see if I can win the title of honorary citizen for him this year." ”

I squinted at Lao Lu and said, "Then I'll thank you very much!" ”

"And what do you do?" Tang Zhenguo seems to want to get to the bottom of it.

I pulled my seat belt, turned my head to look at Tang Zhenguo's swarthy face and said, "Have you watched "Sherlock Holmes"? ”

Tang Zhenguo shook his head.

I added, "Sherlock Holmes was my idol, so I chose the same profession as him, consulting detectives." ”

Tang Zhenguo sighed, obviously still seemed to understand, but I saw that he had already taken out his mobile phone to inquire about something, I guess he was checking "Sherlock Holmes Detective Collection" and "Consulting Detective". But at this time, I watched him carefully and carefully inquire, and another important person in "Sherlock Holmes" suddenly appeared in my mind. Thinking of this, I quickly turned my head, and it seemed that a smile appeared on my face unintentionally, and I could feel that this smile came from my heart. I seem to be expecting something, and this anticipation is coming soon.

"By the way, I just chatted with the old woman for a while, and I learned something that may help you solve the case." Tang Zhenguo said in his deep voice.

I heard Lao Lu snort with some disdain, but I turned my head again with great interest and asked, "Zhenguo, let's hear it." ”

Tang Zhenguo cleared his throat, sat up straight and said, "The old woman said that there is a woman in Wu Stonemason, and that woman often comes to Wu Stonemason's house secretly at night, and occasionally during the day. The woman seemed to be in her thirties, and the old woman had seen her a few times, and the woman's eyes were always dodgy. She said that such a woman is not a good thing at first glance, and she must be here to steal a man. This Wu stonemason was a famous handsome guy when he was young, but he didn't know why he hadn't married a wife, and he hadn't seen any dealings with women before, and it was in the past six months that such a woman appeared. ”

I obviously felt that the speed of the car had slowed down, and I knew that when Lao Lu was thinking about the problem, the speed of the car would slow down.

"What else do you know?" Lao Lu grabbed a sentence and said.

Tang Zhenguo continued: "The old woman said that she heard the woman come again last night, and said that she knew it when she heard the sound of high heels, because there were old people and rural women in this building, and no one would wear high heels at all. But for some reason, she hurried downstairs again. ”

"What time was it last night?" Lao Lu asked.

Tang Zhenguo said: "I didn't ask about this. ”

Lao Lu hurriedly took out the phone, dialed and said: "Xiao Liu, hurry up and ask the old woman in room 301 next to the scene of the crime, when did the woman's footsteps you heard yesterday happen, and by the way, ask her everything she knows." ”

I quietly gave Tang Zhenguo a thumbs up, and I could see some smug looks on his face, which was interesting.

"How about it, Lao Lu, I said that I want to listen to the opinions of the masses more!" I said as I looked at my two mustaches from the small mirror of the passenger visor.

Lao Lu didn't refute, mumbled, and continued to drive his car intently, scolding from time to time at those skilled taxis who rushed up with a trace of gaps: "Damn, if it's a police car driven by Lao Tzu, do you dare to say goodbye to you?" ”

The telegraph road has always been blocked, and we didn't talk much along the way, but from time to time I heard Lao Lu scolding the street a few times, but I also felt funny.

When we came to the central hospital, we found another person who had been poisoned by gas.

The man sat in a hospital bed, with a round face and a flat head, a cleanly shaved beard, and a slightly chubby body. Because of sitting, the height cannot be accurately assessed, but it will not exceed 1.7 meters. He didn't change into a hospital gown, and from his expression, he shouldn't have been deeply poisoned, but he looked a little sleepy.

There was a woman standing beside him, about thirty years old, wearing light makeup, she was considered a beauty, and she was dressed quite fashionably in this winter, with long dyed yellow hair draped over her shoulders in big waves, full of femininity. A pair of black high heels made her figure perfect. Later, I learned that this beauty with a height of 1.7 meters was actually the wife of this fat man who was less than 1.7 meters tall.

Lao Lu has always been straightforward, he said to the patient: "I am Lu Jinfeng, the captain of the district criminal investigation team, and I am here to learn about some relevant information about the gas poisoning last night, and I hope you will cooperate." ”

The fat man's sleepy and languished face nodded slowly, and the woman next to him also slowly sat down in the nursing chair, and her movements were still very elegant. Next to the guard chair was a large old canvas satchel, which was supposed to be a stonemason's kit.

Lao Lu turned his head to me and said, "Ouyang, you ask!" ”

I took a step forward, walked to the side of the bed, and asked the fat man on the bed, "Your name is Xu Tianwu?" ”

The fat man nodded.

"What is the relationship between you and Wu Qiguo?"

"We are old classmates, and we can be regarded as peers, and we are all making stones."

"Where do you live?"

"Zhoujiaba."

"Why did you get together for a drink last night?"

"The old classmates haven't seen each other for a long time, and this time because they participated in the fight against Qinglongyan together, so they got together for a while. I didn't expect this incident to happen, and the people around us persuaded us before, saying that this stone could not be beaten and that it was spiritual, and that people had died because of hitting this Qinglongyan before. We also laughed at their superstition, but we didn't expect this to happen to us. Xu Tianwu spoke a little excitedly.

I stared at Xu Tianwu's expression and said calmly: "That's superstition, not credible." What do you say when I ask, don't say what you didn't ask, understand? ”

Xu Tianwu nodded.

I continued, "What did you drink yesterday?" How much did you drink? ”

Xu Tianwu said: "The wine I drank from the winery, about a pound per person." ”

"Is it a Lie Bar?"

"It's a good wine from the Moon Bay Winery, I don't know if it's a strong spirit."

"No wine bottles were found at the scene of the crime, but what about the wine bottles?"

Xu Tianwu looked at the woman and said, "Wife, show them the wine jug." ”

The woman stood up and gave me a green camouflage military kettle from the bedside table next to the bed. Xu Tianwu then said: "It's the wine in this kettle." ”

I took the kettle and looked at the body, the capacity marked on it was one liter, and judging from the newness of the kettle, this kettle has been used for some years. I unscrewed the lid of the kettle, and a strong smell of wine came to my nose, just like the wine glass at the scene of the crime.

I tightened the lid of the kettle and returned it to the woman, who casually placed the kettle on the bedside table.

"Comrade policeman, are there any more questions?" Xu Tianwu stared at me and asked.

I shook my head, and I couldn't see in his eyes the fear or joy of a man who had just survived, but rather an excessive composure.

Not far after the three of us walked out of the ward, Lao Lu looked back at the ward, and then asked me, "Do you suspect that the murderer is this Xu Tianwu?" ”

I frowned and said, "It's very likely, I always feel that something is wrong, you'd better send someone to keep an eye on him, and that woman should also star." ”

Lao Lu snorted.

I continued: "Find a way to check the surveillance footage of yesterday's crime scene to see if there are any other suspicious characters?" ”

Lao Lu said: "This is already being investigated. ”

I nodded, lost in thought. In the elevator from the hospital, Lao Lu received a phone call, saying that he heard the footsteps of the woman from the old woman of 301 at about 8 o'clock in the evening, of course, the old woman still told some legends about the green dragon.

At this time, it was already noon, outside the hospital, the three of us found a bright and clean noodle restaurant and each ate a bowl of Wanzhou's unique fried noodles, and Tang Zhenguo also drank a bottle of two taels of Xiaoshi Xiantai liquor. I don't drink alcohol when I eat noodles, I just like to eat two cloves of raw garlic. Only Lao Lu didn't have any strange habits, and insisted that he should have it, that is, he put a lot of oil and chili peppers.