She thought for a while and repeated: "A secret room for ordinary humans."

She opened the portfolio and put the photos on the table.

"You see, the apartment where the deceased lived was on the tenth floor. According to her post-mortem autopsy report, we found that she was thrown from a tall building after being killed. The blood stains on the balcony can also prove this. "

"She was killed, her head was beheaded, and the inner alchemy was taken away. The murderer threw her off the balcony on the tenth floor. Because there was a power outage that night, it was dark and late at night, and there were no pedestrians on the road, so no one noticed. , just heard a little noise."

"And, the report says... the door of this house is locked, but the key is on the balcony of the room."

When Bai Ge heard this, he immediately raised his head: "Is the key on the balcony?"

"Yes." Tachibana Chiyuki explained: "That is to say, if the murderer pushed the deceased off the balcony, if he left through the main entrance, he would not be able to lock the door; because the key is on the balcony."

"So, it's a secret room." Bai Ge clasped his hands together: "It's interesting..."

"It's a secret room, but it's just for ordinary people. With the athletic ability of ordinary human beings, there is no way to leave independently from the balcony on the tenth floor. If you accidentally miss a step, you will be smashed into meatloaf, but monsters can... With the physical ability of monsters, monsters who are good at climbing can easily climb up to the tenth floor." Tachibana Chiyuki said: "These two cases almost allow us to lock the murderer outside the range of normal humans."

When she said this, she handed over another photo.

"This time, there is still a black swallowtail on the body." Tachibana Qianxue closed the file. The difficulty of these two cases made her unable to find a breakthrough, so she could only look at Baige: "The general situation is like this. Where do you plan to start looking next?"

Bai Ge stared at the blood-stained black swallowtail butterfly on its wings, thinking silently.

These two cases are considered interesting. Although he is not a detective, as a game player, his ability to process fragmented information may not be weaker than that of a detective.

Naturally, more information will be obtained next.

The files of the first two cases are already detailed enough, and he may not be able to find out more information. Three or two days have passed, and even if he searches now, a lot of time-sensitive evidence has been destroyed.

He crossed his fingers.

At this time, a little reminder and a new murder case are needed.

Just like Kindaichi needs his childhood sweetheart Miyuki to give him tips, no matter how powerful a detective is, he also needs other people's "unintentional words" as a divine assist to display his intelligence and ability, but can his partner be able to give him tips?

Bai Ge glanced at the bewildered orange.

"Why are you staring at me?" Orange said, "Do you suspect that the murderer is me?"

"..."

Bai Ge had to give up his expectations of his partner, and thought about how he could handle these difficult cases alone.

He pressed the center of his brows to analyze the case first.

"First of all, this is an unquestionable serial murder case."

"Serial murders are the worst of all cases. Most of the murderers are psychopaths. They have a strong desire to kill and cannot stop themselves. If they are not stopped in time, they will continue to kill."

"There is a very important point to focus on in the detection of serial murders, and that is the logic of the murderer's killing. If a murderer chooses any target unconditionally, it is indeed a very difficult target. A murderer who chooses a target at random has no plan. It is easy to be detected, but it is clear that the murderer this time has a plan and a goal, so the murder logic of finding the murderer has become an important strategy to detect his true identity."

"What is the logic of killing?"

"A careful serial murderer's choice of targets is not random. Finding the connection between the victims is the killer's murder logic."

"Now the two deceased have a lot in common. The three most important points are that they are both half-demon identities, the second is that they lack a head and inner alchemy, and the third is the black swallowtail...Actually, I don't think the black swallowtail is the murderer. , because she seldom does such troublesome things, she doesn't need other reasons to kill, and she doesn't choose such troublesome means, her approach is straightforward and neat, and it can even be said... the killing is very clean, and she doesn't know how to dissect He took the inner alchemy heartily, and cut off the head in trouble."

"Then the starting point now is the inner alchemy... The murderer killed someone to take away the half-demon inner alchemy. This is the most reasonable explanation, but I also wonder why he took the dead man's head. What's so special about the head? Does it work?"

Tachibana Chiyuki shook her head, the inner alchemy was in the organs, not in the head.

"Maybe, it has a habit of collecting human heads? It's a pervert after all..." Juzi guessed.

"I can't rule out this possibility, but it's not very likely." Bai Ge shook his head: "If it's really a serial murder fan with a collection habit, he wouldn't treat his collection so roughly. If it were me, I would Carefully cut off the head of the dead, instead of painting the whole house with blood."

"In order to take away his target, whether it is the head or the inner alchemy, the murderer's modus operandi seems to be unscrupulous, even a little frenzied... and he committed two crimes in a row within three days, the frequency is too high, which proves that he is very anxious, even I don't want to wait any longer..."

"Generally speaking, serial murderers meet the three elements of Macdonald, namely bedwetting, arson, and animal abuse. It's just that the target this time is a monster. I don't know much about the psychology of monsters. For monsters, killing may just be instinct."

Orange pouted: "I think it's unlikely to be a monster."

Bai Ge stopped and asked, "Why do you say that?"

"The incision is too clean." Juzi complained. He glanced at the photos on the table again, and couldn't help but feel sick again, but he insisted on finishing: "You see, the incision is too smooth, like a scalpel. It's like opening, if it's a monster, why don't you just rip out your heart, liver, spleen and lungs with one paw? And you need a knife to slowly cut it open for you?"

Bai Ge was taken aback for a moment. He was afraid of nausea, so he didn't look at the photos at all. Now that he was reminded, he realized that he had made a low-level mistake, and immediately compared several photos.

Although he was disgusted in his heart, he also found that the incisions on the corpse were very smooth. The wound on the severed neck was like being severed by a bone cutter, but the wound on the chest and abdomen was very flat. The internal organs protruded outwards, but the incision was very smooth... Even the internal organs were not injured, but only the outer layer of skin was cut. With such care, there must be some ulterior secret hidden.

"Orange, it's really yours." Bai Ge said, "It seems that the murderer may indeed not be as terrible as guessed in the file."

At this time, there was a knock on the door, and a guard walked in. He opened his mouth and asked, "Is there a Mr. Bai here?"

"Yes." Tachibana Chiyuki asked, "What's the matter?"

"Someone sent a letter just now, saying it was for this gentleman." The guard handed over the white envelope and left.

"Your letter." Tachibana Chiyuki said.

"Mine?" Bai Ge didn't know who would send the letter, so he opened the envelope and took out a piece of white rice paper.

The first thing I saw was not the words, but the lifelike black swallowtail butterfly reflected on the rice paper.

Bai Ge's heart froze, and he looked directly at the signature.

I saw that the signature of this letter was impressively written with four words.

——Black Swallow Butterfly.

Chapter 54

——Dear Bai Ge, I think you should have arrived in the extreme east. Whenever I was found soon, you would always come after me within three days. I believe this time is no exception. The cherry blossoms in the extreme east are very beautiful. I'm here to enjoy the cherry blossoms this time, but there are still three days before the cherry blossoms open. In order to pass the boredom, we might as well play a game of finding people.

——I won’t hide from you far away, and I won’t be easily found by you. You only have three days to find me... If you can’t find me, and no one will accompany me to enjoy the cherry blossoms, I will endure Can't help but let the cherry trees all over the city be stained with blood.

——For the next two days, I will send you a letter every day, and each letter has a hint, follow the hint to find me.

——I will only wait for you for three days.

——Black Swallow Butterfly.

Bai Ge closed the letter with a slightly subtle expression.

It is really surprising that Black Swallow Die would ask for it.

"What did it say?" Tachibana Chiyuki asked.

"She wants me to find her within three days, otherwise the city of cherry blossoms will be washed with blood."

Bai Ge said: "No matter how you look at it, this is a threatening letter."

"No, no, I think it looks like Feng Tsundere's love letter..." Orange asked strangely: "Is she so confident?"

"It's not a question of self-confidence, she just treats it as a game." Bai Ge said lightly: "She likes playing games so much, of course I am willing to cooperate with her... Rather, this letter from her has given me more confidence." definite goal."

Juzi spread her hands: "I think this letter will confuse our goals. We are looking for Black Swallow Butterfly and investigating the case at the same time. Which one is better to take care of both?"

"Look at the first hint she gave." Tachibana Chiyuki said.

"I hope it's not something like smoking a cigarette to calm down." Orange whispered.

Bai Ge turned the letter paper over, and found the prompt text on the back.

——It can be big or small, it can rise or hide; it can make clouds and mist when it is big, and it can hide its shape when it is small;

"This sentence is so familiar." Tangerine rubbed his chin: "This probably means..."

"As you think." Bai Ge nodded.

"Water vapor." Tangerine pointed to the letter paper and said, "It must be water vapor."

"Steam shit." Bai Ge knocked on the table: "This is about the dragon! Do you understand the dragon? Haven't seen the old version of the Three Kingdoms? Even if you haven't read the Romance of the Three Kingdoms, you should have watched the TV series! That line Nothing has changed!"

"Oh, so it's the Three Kingdoms." Tangerine rubbed the back of his head and said with a dry smile, "I said why it looks so familiar, Zhuge Liang must have said that."

"...Why didn't you pull Lu Xun out to take the blame." Bai Ge rubbed his eyebrows.

"Lu Xun never said anything." Juzi tried to get away with it.

"Okay, stop talking about double-mouthed comic dialogue." Tachibana Qianxue interrupted their meaningless conversation with a frown, and asked, "What does the dragon's hint mean?"

"The dragon's hint has three interpretations."

Bai Ge raised three fingers.

"First, what is the dragon used to refer to? The dragon itself has many meanings. It can refer to special people, special terrain, and special objects."

"Second, what the dragon means refers to itself."

"Third... the dragon has no meaning, it's just a means to confuse us."

Bai Ge put down the first and third fingers, and raised up the second finger.

He pointed his middle finger at the orange with a serious expression.

"I personally prefer the second possibility, Orange, do you know what I mean?"

Juzi looked at Baige's middle finger, and pursed her lips for a while, feeling MMP unable to speak out.

"That is to say, the dragon refers to the monster, the next victim?" Tachibana Chiyuki frowned: "But the dragon..."

"It may not be a real dragon, it may be a dragon, or it may just be a 'big snake'."

Bai Ge folded the letter and put it back in the envelope.

"Your country's definition of dragon is slightly different from our definition of dragon... I don't know if there are real dragons here, it's just a guess."

"But from your hesitant expression, I can tell that there are really dragons here."

"Looks like we'll have to go out."

Juzi rubbed his hands, eager to try, "Is it finally time to start an external investigation?"

"Wait..." Tachibana Qianxue stood up, "I'm with you."

"You don't need to." Baige handed the envelope to Tachibana Qianxue: "Go and check the source of this letter, and check to see if there is any special substance on this letter."

Tachibana Chiyuki was stunned: "What do you mean? Even if fingerprints can be found on this letter, it's meaningless..."

"It's not a fingerprint, but a test to see if there are any special substances, such as pollen, sugar, salt, etc..." Bai Ge explained: "Through scientific means to comprehensively detect the substances contaminated on this paper, we probably It can analyze what kind of environmental interaction it has experienced, and then follow the clues to find out where the letter was printed."

What he said was a bit mysterious, so that Juzi was completely confused.

Tachibana Chiyuki was also puzzled, this seemed to be a modern scientific investigation method.

"As long as it's easy to use, don't look down on science." Bai Ge turned around, waved his hand, and walked away without looking back: "Then leave it to you, Tachibana Second-Class Special Investigator."

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