On her way back to school, Kana suddenly noticed a police car parked in front of a hotel and some police officers. Kana knew that something must have happened, so she quickly entered the hotel.

It is impossible to evade the police. But Kana still forcibly came to the scene of the crime.

The deceased was a waiter at the hotel, the body was on the third floor, and the cause of death was a dagger stabbed in the back.

According to the people at the hotel, this waiter has been serving guests since 8:00 in the morning. The order is from the first floor to the fourth floor.

First floor: The person who has received the service is called Mori Gen Zhen.

The policeman asked, "When did the deceased come to your room?" “

Morigen recalled for a moment and replied, "It was about 8:10" and "What did she do at that time?" "Hand me a document, it's not something important." "Can you show us the file?" "Well, uh" "Did the waiter behave unusually?" "No, I don't. How could I be concerned about these. "Okay, that won't bother you."

2nd floor: The person who received the service is called Nobuko Miyano.

The police found her and asked her the same questions as before, and Nobuko's answer was that the waiter had sent her a letter at 8:18, and that the letter was a private matter and could not be shown to the police.

On the third floor, the floor where the deceased was found, the person who received the service was called Reiko Suzukawa. "Police? Is there anything you want me to do? Reiko spoke first. When did the deceased do what? "At 8:26, just handed me a package." "Can you show us?" "What's there to see."

In desperation, the police had no choice but to go to the fourth floor. According to the manager of the hotel, the waiter will only go upstairs in a straight line and will not make a detour first. So the deceased should not have been to the fourth floor. But it is true that one person has been served.

"My name is Naoki Ryokura. If you have something, say it quickly. “

The policeman asked again, and Naoki said, "At 9:10, the waiter brought me a glass of water, I already drank it, and the cup is still in the room, so you can check it if you want to." ”

After identification, there was no abnormality in the cup.

"Mr. Ryomura, is there anything unusual about that waiter?"

"It's not an anomaly. She just didn't say a word when she brought me water, and when she asked her something, she just shook her head and nodded, and that's it. ”

Kana also listened to the confessions of the four. She went to the corpse and found some small, yellow, thin fragments next to it.

"Mr. Officer, what are the occupations of the four suspects?" "You are?" "Tell me, okay?" "Uh, okay. Senyuan is an architectural designer; Miyano is an elementary school teacher; Ryokawa is a hairdresser; Ryokmura is a university professor. “

Kana continued to ask, "What was the time of death of the deceased?" ”

Although the policeman didn't know what Kana wanted to do, he still replied: "8:32, it's strange, obviously I went to the fourth floor at 9:10, what the hell is going on, it can't be that the corpse got up again and then continued to die after delivering water, right?" It really doesn't make sense. “

Jiana smiled indifferently: "It doesn't make sense? That should make sense. “

Kana brought everyone together and said, "I know the truth about this incident. The murderer is Miss Reiko Suzukawa. "What are you talking about? The waiter brought water to someone at 9:10. Is it because the deceased is on my side that you judge me as a murderer? "Of course it won't be so hasty. Let's start with your modus operandi. After the deceased handed you the package, and as you were about to leave, you killed her from behind with a dagger, and it was 8:32 at that time. For a while, you disguised yourself as a waiter using the tool in your package, a human skin mask. This is not difficult for you as a barber. This is the reason why there are yellow shards next to the deceased, which must have fallen from the mask. Later, you go upstairs as a waiter to deliver water to Mr. Ryomura. The purpose is to make others doubt the truth. Although it is disguised, there is still a difference in the voice. So you don't say a word when you deliver water. After delivering the water, come back and take off the mask and put it back in the package. The reason why I am so suspicious is because after the deceased sent you a package, it took a long time from 8:26 to 9:10 to deliver water to the fourth floor. But the hotel manager said that the waiter would go upstairs, why did it take so long? Combined with the fragments on the ground, it makes sense. Now, just look at that package of yours and it's all over. ”

"No need. I killed her. Reiko said, "Because, a year ago, in this hotel, she killed my sister because of a mistake in service."

In this way, the case of the waiter's murder also has the truth. Before the police asked Kana why she was so concerned about some of the incidents, Kana had already left the hotel

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