The uniformed police guarding the crime scene greeted several superiors, then stepped aside and continued to guard against onlookers and media from approaching.

Chen Guangyao stood in front of the door and introduced to Fang Zhenyue and Jiayi:

"These are small rooms like dormitories. Each room has only one living room, and the rooms are separated by themselves. There is a public bathroom on the other side of the corridor. This family divided the room into two bedrooms, a kitchen, a bathroom, and a living room. Each room is very small and the soundproofing is not good.

"The murderer did not pry the lock violently."

Chen Guangyao pointed at the door lock again:

"It is well preserved. The murderer may have stolen the key, or he knows how to use some small tools to open the lock. "

Fang Zhenyue squatted down, looked at the keyhole, touched the edge of the keyhole, and then said with experience:

"The murderer used two wires or something like that to pry the door open."

"Are you sure?" Chen Guangyao raised his eyebrows.

"Sure, I can show you." Fang Zhenyue began to fumble in his pocket.

"...No need. "Chen Guangyao stretched out his hand to stop him, with a strange expression.

Even a forensic expert like him didn't understand this kind of technique... They all said that Fang Zhenyue was a 'capable person' who would use any means to handle cases. Now it seems that he is, he can even pry a door.

Fang Zhenyue nodded. Since the other party didn't want to watch his performance, he had to do it in a good manner. She kept it in her pocket and didn't take it out.

Jiayi glanced at Brother Yue and couldn't help laughing.

She was just thinking about how to prove that the murderer used a tool to unlock the door, but Brother Yue helped her.

When Chen Guangyao led everyone to the room, Fang Zhenyue stood at the door and called Inspector Guo Sir:

"Mr. Guo, you can put an ad in the newspaper tomorrow to remind the citizens, especially those with young women at home, regardless of the floor level, to put a table, a chair, or other alarm devices at the door of the house before going to bed at night. When the murderer pushes the door at night, it can make a loud noise, or make the murderer unable to push the door open even if he pries it open, so as to prevent the murderer from quietly prying the door open and breaking into the house to commit the crime .

"Also, some dogs may not bark when strangers enter the house, and some may sleep more soundly than their owners. So even if you have a dog, you should pay attention to prevention."

"Ok, is there anything else you need to tell me?" Sir Guo asked after thanking him.

"For the time being, there is no more complete portrait of the murderer. I will call you when I have further information to remind the citizens or inform the citizens." Fang Zhenyue said and hung up the phone.

Chen Guangyao turned his head and glanced at him. Before he put the mobile phone back into his pocket, he saw clearly that Fang Zhenyue was using the same brand and model of mobile phone as Jiayi.

Jiayi took out her notebook, on which she had simply drawn the crime scene in her mind flow image. She looked around and it was basically the same as in the notebook.

The murderer was not panicked when committing the crime. He was slow and calm.

Perhaps it was because he had killed too many people in Hong Kong and he had become accustomed to it. The fear and panic of being caught and being killed in the past may have gradually become calm through the accumulation of experience and improvement of murder methods in the process of repeated crimes.

If the murderer was so calm when handling his first case, the Watergate case, then perhaps it could mean that he had killed more than one person before coming to Hong Kong. Jiayi has only seen the mind-flow image of the Shek Kip Mei case, so it is difficult to judge the murderer's mentality for the time being.

Walking into the kitchen, Jiayi saw the stove and table that had been used. Chen Guangyao said, "There are traces of cooking meat and eating in the kitchen. I checked the fingerprints in the kitchen, and the murderer's fingerprints were left on the gas stove and other places."

"The murderer was still cooking and eating here after the murder." Fang Zhenyue continued.

"It should be." Chen Guangyao nodded.

Jiayi did not respond to the two people's words, but turned to look at the other side of the kitchen table.

After dinner, the murderer packed up the remaining food in a bag and took away a thermos cup on the table that was used to carry milk for babies when going out.

"Brother Da Guangming, are there fingerprints of the murderer on the kettle?" Jiayi pointed to the empty kettle next to the boiled water.

"Yes." Chen Guangyao nodded.

"If he boiled water immediately and drank it immediately..." Jiayi looked around and asked in confusion: "It seems that there is no trace of the cup being taken out and used?"

"Yes." Chen Guangyao nodded.

"Brother Da Guangming, when can our Forensic Department issue a list of [lost items in the Shek Kip Mei case]?" Jiayi asked.

Chen Guangyao sighed, "It's already been done, but this family is not like the previous victims who lived in villages and small houses. They rarely invite neighbors to their home. After all, the mobility of nearby residents is too high, and most of them don't have time to get along and become friends. We have too little supporting information to judge the victim's home. "

Like in the previous case 1, there was a knife rack with 4 holes in the kitchen, but there were only two knives left in the house.

In addition, every household basically needs a kitchen knife. After the forensic department arrived at the scene of case 1, they found that there was no kitchen knife in their home.

So it can be basically inferred that the murderer stole the kitchen knife.

At the same time, the victim's relatives and neighbors also said that when they came to visit, the victim would often peel apples and cut fruits for them to eat, using a thin and long fruit knife.

This knife was also lost. Looking back at the knife rack with four holes, it can be basically concluded that

there were four knives in the victim's home, and the kitchen knife and fruit knife were probably stolen by the murderer.

Then Case 2 occurred. The fatal wounds of the victim were all caused by sharp weapons. After the forensic officer examined the wounds, the knife he simulated was basically the same as the fruit knife lost in Case 1.

This further supports the judgment in Case 1 that "the two knives are lost items."

However, in the Shek Kip Mei murder case that Chen Guangyao was responsible for, there was no such obvious thing that could be used as a murder weapon. If other daily items were lost, they basically could not find it.

It is even more difficult to judge the loss of clothing.

So even if he produced such a lost property list, he could only explain the loss of money, finances, food, etc.

"Brother Da Guangming, is it possible that there was a cup here that he used to hold water? Otherwise, where did the kettle of water go?" Jiayi turned around and looked at Chen Guangyao in confusion:

"It's impossible that he directly used this kettle to drink water."

Chen Guangyao frowned slightly and turned to leave the kitchen.

He had taken the forensic team to check the fingerprints of the quilts in each room, and no quilts with the murderer's fingerprints were found.

He searched around again, but couldn't find any other water containers that the murderer might have taken to other rooms after drinking water.

He gasped and turned to ask Jiayi:

"So, you mean he took a cup?"

"Some kind of water container, and it's probably heat-resistant." Jiayi pointed to the kettle in the kitchen, "After all, the murderer specifically boiled water. Since he took food from the victim's home, it's normal to take some hot water."

"Yes." Chen Guangyao nodded.

If the murderer couldn't eat at a hotel and didn't dare to be too exposed to people, he might just buy some convenience food.

Although it's already June, it's really uncomfortable to eat only cold food and drink cold water every day. Bringing a kettle of hot water will keep your stomach warm for at least a few days. Even if you sleep outdoors at night, drinking some hot water will make you warmer.

"A thermos is usually not too small and usually cannot be completely put into a trouser pocket. If you hold it casually or put it in your pocket, it will be exposed a little bit... If we know the color and style of this thermos, maybe we can have another clue when looking for the murderer." Jiayi thought as she spoke.

Chen Guangyao nodded, turned his head and looked at Fang Zhenyue. The two of them put on rubber gloves and began to search through the boxes and cabinets - hoping to find some photos of the thermos, or the documents or packaging when the thermos was purchased.

Jiayi strolled out of the kitchen and walked into the room where the elderly and the baby used to live, looking around. She lowered her head and stared at the stroller. It was indeed the same color as the kettle: blue and white.

There is a circle on the side of the stroller, which is a slot for the thermos bottle.

Turning around and walking to the door, she asked Chen Guangyao:

"Brother Da Guangming, look, there is a slot on this stroller that looks like a cup."

Chen Guangyao immediately stepped over, squatted down and carefully checked it, and agreed with Jiayi: this should have been used to hold the kettle.

Standing up, he looked around and found a rectangular cardboard box next to the old man's bed. It was filled with many plastic bags, paper bags and other reusable things collected by the old man.

He stood up the long cardboard box and saw a color photo of the stroller after it was assembled on it - this was the cardboard box that the stroller was packed in.

In the photo, a hot water bottle was stuffed on the side of the stroller. It was blue and white, and the size and capacity of the bottle were marked on the side.

He turned to look at Jiayi in disbelief, his eyes full of surprise and recognition. He didn't care to praise Jiayi. He picked up the camera hanging on his chest and took a photo of the stroller.

"It may be it." Chen Guangyao nodded.

Jiayi smiled and returned to the kitchen. She patted Brother Yue who was still rummaging through the cabinets and said with a smile: "Maybe we found it."

After saying that, Jiayi suddenly pointed to a place on the kitchen table as if she had discovered something by accident. She turned around and called Chen Guangyao again:

"Brother Da Guangming, look, there seems to be a round mark here."

Chen Guangyao walked closer and found that there was indeed a grease circle where Jiayi pointed.

When the chef cooks, oil stains will fly out. Although there are traces of wiping, there are still faintly visible circle marks. The inside and outside of the circle are clearly distinguished. There are many oil stains outside the circle, but the inside of the circle is clean.

Apparently, a round object was placed here before, blocking the oil stains.

Chen Guangyao hurriedly took out a ruler from his small box, measured the diameter of the circle, turned around and said in surprise: "The size of the bottom of the thermos cup that comes with the baby carriage is exactly the same!"

He looked around again, picked up various seasoning boxes, etc., and found that the bottom of these boxes was indeed clean. If the seasoning boxes are taken away, it will leave a square mark on the table just like taking away the thermos.

"I will print the photos and write a report as soon as I get back." Chen Guangyao put away the ruler and turned to Jiayi and said seriously.

Before coming here, he just accompanied Fang Zhenyue and Yi Jiayi to introduce the crime scene and cooperate in a simple crime reconstruction.

Originally, he didn't even want to bring his own treasure chest, thinking that he had already done a very careful and detailed investigation. If he came again in such a short time, there should be no evidence to be extracted and no new clues to be investigated.

Who knew... there was a new discovery!

It was a very meaningful core clue.

"Great, this way, the portrait of the murderer will be clearer." Jiayi saw in the flow image that the murderer did not take the backpack from the victim's home, probably because he was afraid that such things would not match his image of a physical laborer and would be discovered. So the murderer only took a large, sturdy, opaque plastic bag and used it to carry hammers, food, and other items.

The water bottle could not fit into the bag, so the murderer smeared some dust on it to make the blue and white eyes look darker, and then stuffed it into his trouser pocket. When he walked, half of the water bottle was exposed on his head.

Although it is actually very inconspicuous, if you observe carefully, you can immediately find that he has a bulging big thing in his pocket.

Looking back, the police set up checkpoints at various intersections. When the police parade intensively, if they happen to meet the murderer on a narrow road and see that the other party meets the information such as "hair length" and "carrying things", and then go over to do an ID check, the other party will immediately reveal the truth -

the uniformed police will have a high probability of catching the murderer.

"Brother Da Guangming is so powerful!" Jiayi was in a good mood after a breakthrough.

She was grateful to Chen Guangyao for helping her transform the information she saw in the flow image into scientific evidence, and gave him a thumbs up.

Chen Guangyao showed a proud look on his face, then turned embarrassed. After waving his hands, he kept talking to Jiayi:

"Jiayi is still quick-witted! Clues like this cannot be discovered by the expertise of the forensic department alone, but also require a smart brain! I knew that when I came to the scene with you, there would definitely be new discoveries! Tsk tsk, as expected..."

In fact, he really didn't expect there would be new discoveries before he came, but this did not prevent him from flattering her wholeheartedly at this moment.

Jiayi's cheeks also turned red due to the compliments. The two of them exchanged pleasantries, and Fang Zhenyue stood by with his arms folded, unable to help laughing.

At this moment, the baby call on Chen Guangyao's waist suddenly beeped. He picked it up and saw a line of words on it:

[The results of all the hair matching at the scene have been released]

"What's the matter?" Fang Zhenyue saw Chen Guangyao looking around and asked.

"All the hair found at the scene has been matched. It should be possible to determine which ones belong to the victims and which ones do not belong to the victims and may belong to the murderer. I'll call the office to ask about the specific situation... This family doesn't seem to have a landline phone." Chen Guangyao thought for a moment and said, "I remember there seems to be a public telephone booth downstairs-"

"No, use mine."

"Use my phone, Da Guangming brother."

Jia Yi and Fang Zhenyue spoke almost at the same time, taking out their mobile phones from their pockets.

The next moment, two identical mobile phones appeared in front of Chen Sir.

"..." Chen Guangyao.

What? Is it great to use a couple's phone?