"Oh?" Sister Masako seemed to have some interest: "Why?"

"Pinhole." Zhou Yan pointed to the small pile of pinholes on the inside of the deceased's arm and said: "If an addict wants to take drugs, he needs to insert a syringe into his blood vessels. The subcutaneous and intramuscular injections are very effective, even if it is considered

This girl is rich and can't be wasted like this.

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And if you use needles in the same area for a long time, the skin in this area will become very hard, but this girl's skin is still very soft, which is very strange."

"Oh~ You seem to be very good at medicine and the human body~" Sister Masako's eyes were even stronger, and she even got goosebumps when she looked at Zhou Yan.

However, Zhou Yan seems to have some understanding of medicine. This situation has happened before. He can always bring out some relevant medical knowledge when needed, but strangely, he doesn't know why he is

Will know these things.

"So, what's going on with these pinholes?" Sister Masako continued to ask.

"Diabetes." Zhou Yan said.

"diabetes?"

"Yes, to be more precise, [Type 1 diabetes]. Patients with this disease are not old and rely on insulin... to have to be injected on time and on time every day.

Most of the injection methods are soft muscles, and many people choose thighs or belly.

But... the deceased is a girl. If she is injected in a normal place, it will affect her dressing, such as wearing a navel-exposed dress, a miniskirt, or a circle of needle holes on her belly or thighs. Then she must have been wearing a thigh.

Can't accept it.

That's why she chose a small circle on the inside of her arm, because it won't be exposed even if she wears short sleeves. Even if she wears shorter clothes, she can wrap a circle of ribbons, which may look quite fashionable."

Sister Masako nodded: "So, based on these, you can infer that she is just a diabetic?"

"It's almost the same. The main reason is that this kind of pinhole is very representative. You have never been in contact with diabetic patients. You may not know that the needle for injecting insulin is very small and short, which is very different from ordinary injection needles."

"..." Sister Masako raised her eyebrows and stared at Zhou Yan.

"Hehe, and around the bloodstains of the deceased, I found a lot of ants..."

"Well, it's pretty good. Both observation and divergent thinking are barely qualified~" Sister Masako said as a class teacher at the school.

"This is just 'barely qualified', isn't it a bit too strict?"

"My exam is so strict. If you are not satisfied, you can finish the exam early~" Sister Masako said with a smile: "Hurry up and continue your inference."

"Oh, the next inference is very simple." Zhou Yan said quickly: "The murderer probably saw these pinholes on the deceased's arm and mistakenly thought the deceased was an addict, so he injected an excessive amount of hallucinogen into the deceased's death.

Inside her body, she threw her downstairs, so that she could forge the illusion of [who accidentally fell off after being hi."

"So, the murderer may be a gangster, or someone holding a hallucinogen."

"Yes." Zhou Yan nodded, and thought to himself: "Now I can only think of so much. The rest can be seen before making a judgment on the autopsy results."

But before the words end...

"Look at this, can you give you some inspiration?" Sister Masako suddenly took out a small plastic bag.

Zhou Yan was stunned and reached out to take the plastic bag.

There is a key inside...the very small one, and you can break it with almost a little force.

"Is this..." Zhou Yan said in confusion.

"The dead."

"Oh?" Zhou Yan looked at the key carefully again and found that nothing special was it. It was just a small key with no key pendant: "So...Is this thing important?"

"It should be very important." Sister Masako said.

"How can I see it?"

"Because... the deceased was holding this thing tightly in his hands before he died."

"Hiss——That's really important." Zhou Yan frowned: "In this way, if we can find the lock that matches this key, we can solve this puzzle?"

"Who knows?" Sister Masako shrugged: "Anyway, the most important clue in our hands is this key."

Yes, there are no clues for the time being, the only thing you can count on is this key.

But there are thousands of locks in this city, who knows which key matches this key?

Next... After reading the body and the key, Zhou Yan talked with two witnesses as usual.

The two witnesses were a drunk man urinating in the alley, and a traffic policeman who heard the shouts.

The drunk man was a direct witness. Because he took off his pants, the deceased fell from the sky. With a trouser, he slapped his pants at a distance of only two or three meters away from him, and blood splattered into his crotch.

The drunk man was really scared at that time and shouted while peeing.

The traffic police rushed over and called the police immediately.

During the whole process, both of them were in a state of confusion, and no one looked up at the roof. In other words, even if the murderer lay down on the roof, no one could see his figure.

.

"This witness is too incompetent."

After asking, Zhou Yan muttered helplessly, because there were no clues, the person from the evidence collection department ran to the roof and found that there were no traces of fighting.

"So, what do you want to do in this situation?" asked Sister Masako.

Zhou Yan hesitated for a moment...

"emmm...there are too few clues. The best way is to wait until the deceased is transported to the police station to confirm the identity first, then find her residence, and try to find the lock of the key there.

Let’s start with the social network and see who has the motive for murder.”

"Well, the normal case-solving process will not deduct points, but you don't think of extra points." Sister Masako walked over to Zhou Yan. When she was wrong, the distance between the two was very close, and Zhou Yan could even feel that

Sister Masako rubbed her curly hair in front of her lips...

"Then let's do it as you said first, after all, there is no other good way."

"Oh~" Zhou Yan responded.

Soon, the body was carried into the car, and with the sound of the sirens, the deceased was pulled away.

After the half-hour tossing time, more and more people were around the cordon. After encountering a murder, these idle citizens were like a group of ants who smelled the sweet smell, and one person's

Death naturally became a remedy for these people's boring life.

Everyone stretched their necks and tried desperately to glance at the crime scene and the explosion of blood... because these scenes can be considered exciting.

But there was one person's interest in the crowd, which seemed to be different from others.
Chapter completed!