Kogoro carefully looked at Professor Oyama's body, although he was not as professional as the doctors next to him, but he was once a police officer, and he could still make some simple judgments.

Professor Oyama's hands were pressed against his back, and two hemp ropes were used to tie him tightly. His mouth was also strangled by a towel and then tied into a dead knot at the back of his head.

He sat on his knees against the wall on the side of the door, his eyes wide and glaring at the doorway. There were many traces of blood on his body, and there was a drag mark of blood on the ground.

From this, it can be seen that Professor Oyama should have moved himself to his current position before he died, and it was not easy for him to be tied, and he still had a knife deeply stuck in his back.

There must be some reason why he was enduring the painful torture like this, and he had to try to move over, but judging from the trajectory of his movement, it didn't look like he wanted to go to the door for help.

After thinking for a moment to no avail, Kogoro walked up to Professor Oyama. He took out the gloves he had been wearing for a long time, put them on, and began to examine the wound on his back.

There was only one fatal wound, and that was where the knife was now inserted. The knife was inserted very deeply, and Kogoro roughly judged that it was inserted into the lungs, and Professor Oyama either died of excessive bleeding or death by suffocation caused by a perforated lung.

Either way, Professor Oyama would have been in great pain before he died. Kogoro then looked at Professor Oyama's body, which should have died an hour or two ago, judging by the stiffness of the body.

After looking at the corpse, the next thing to look at is the environment inside the house. Kogoro walked to the open window first, frowning at the footprints outside the window.

The more he looked, the more strange he felt. In a few minutes it was eleven o'clock in the evening, and the snow began to fall after nine o'clock. The heavy snowfall that lasted for so long did not cover the footprints of at least half an hour ago.

In other words, it is very likely that the murderer deliberately left behind afterwards to mislead us and the police. After thinking about this, it is easy to see the situation inside the house.

When the man entered the room, Professor Oyama was unwary of her because of his familiarity. In this case, the murderer directly attacked him, tied him up, and strangled his mouth.

Then the murderer made a simple disguise of the scene, she opened the safe in this room, took all the contents away, made people mistakenly think that it was a burglary, and killed Professor Oyama after discovering someone.

But in Kogoro's eyes, there are several flaws. The first is the footprints outside the window, and then Professor Oyama obviously watches the TV series again, and the sound can completely let the robbers know that there are people inside.

In such a situation, is it absolutely unnecessary for the robber to break into the house at that time? Also, if it was really a burglary, you wouldn't have seen the gold watch on Professor Oyama's wrist, which was very obvious.

Why don't the robbers take this kind of valuable thing, but it is exposed to the outside and cannot be hidden? Finally, as I said at the beginning, this room is too neat.

Even if Professor Oyama is fascinated by watching the TV series, he shouldn't be unaware of the robbers who come in through the window. Even so, he should have made some noise when he was attacked, and the robbers didn't touch anything other than the safe.

All of this only shows that the murderer is someone in this room, and they are the only ones who can make Professor Oyama unsuspecting.

The next step is to gather enough evidence, and the murderer wants to divert the attention of the police and others, but the scene is too poor to do anything at all.

Since the murderer only has this level, it is necessary to check the chess cloth that was pulled to the ground next to the table. There was a lot of blood on the chessboard, but on one of them, there was a small rectangular blank space abruptly.

This is the mark left by something that was covered by something when the blood was splattered, but when it was about to dry, it was removed, but the blood should not be splashed on it, and there was no other blood around the table.

Professor Oyama deliberately left a death message on it, but the lighter was removed only after the blood had dried up. That is, the murderer did it later.

And among them, only Kaori Nakahara, who was the first to come here, had the time to do such a thing.

Judging from the death message, the suspicion is also pointed at her. Death messages should be done according to his own habits and hobbies.

Since there will be a chess cloth here, it means that Professor Oyama should like shogi very much, and he also left clues on it, so it should be even more related to it.

Soon Kogoro found a lighter on the couch, and if you put it on the chessboard, its location is where the car is. According to the name of Professor Oyama, he is the king general, and the car is Kaori Nakahara.

Then what is needed is more evidence. There should be fingerprints of the murderer on the lighter and chess cloth, but this alone is not enough.

Kogoro turned his head to look at the four of them, and his gaze finally rested on Kaori Nakahara. The moment she looked at Kogoro, she panicked, feeling that her crime had been known.

Then Kogoro told the evidence that this was an acquaintance who committed the crime, and everyone was very surprised when they heard it, and they didn't expect that one of them would actually kill Professor Oyama.

"Guys, can you tell us what you were all doing at the time, and if there was anyone or something to prove it?" After hearing his words, the first to speak was Hitoda Ginji.

"I didn't have enough skiing during the day, so I wanted to go skiing the night snow again. But as soon as I got to the ski resort to change clothes, it snowed heavily, so I had to come back again. As for the evidence, I've had a few words with the security guard there, and he should still have an impression of me. ”

"Very good, Mr. Yinji's words should be fine, just ask afterwards to know." "Then I went to help them go to the supermarket at the bottom of the mountain to buy something, and it took nearly an hour to go back and forth, so I didn't have time at all."

"As for me, I was with Jiangjiao at first, and then I went to the bathhouse to take a bath." Kanazawa Tomoyasu fished his head a little in disdain, and his alibi was really insufficient.

"The last one was me, and after the few of them left, I started to clean up the table, then wash the dishes, clean the room, and finally come back after taking out the garbage, and they came back one after another."

After thinking about it carefully, Kogoro asked Conan to go outside the villa and asked him to inspect Kaori Nakahara's car, where there should be excess food, even if it had been thrown away.