Returning to my room alone, I lay depressed on the bed. staring blankly at the ceiling, I didn't expect to encounter a serial murder in such a place. Thinking about what had happened in the past few days, Cao Yang's entry into the house interrupted all this.

"What are you thinking? You can't hear me knocking on the door? ”

"I thought about the recent events, but I didn't expect ......." I didn't go any further here.

"Are you sure you didn't find any clues in Gu Hui's room?" Cao Yang threw his clothes on the bed and sat at the head of the bed.

"Ah, this...... In fact, there are several discoveries. ”

"Oh?" Cao Yang spoke with curiosity. "Tell me about it."

"How can I say it, I was in Gu Hui's room to simply determine the way he died. The police only said that it was Qinghua Jia poisoning, but did not say how the deceased came into contact with Qinghua Jia. ”

"Indeed, this cannot be revealed to others."

"Yes, but I found some clues through a few details. For example, a complete set of teacups in his room was missing a cup, and the tea leaves were not used. This can be concluded that the teacup was only a carry, but it was not tea, and secondly, I found an open box of brown sugar under the coffee table. So ......"

"You mean that the deceased was poisoned by drinking sugar water with a green nail? Doesn't this correspond to Wang Lijun's sentence Do you like to drink sugar water? Cao Yang was very excited when he said this.

"That's right, that's what I decide. But just knowing these is not enough, and there are many doubts. ”

"How to poison it, how to make the secret room. And what is the purpose of doing this? Cao Yang continued.

"You don't think it's suicide?" I asked a little knowingly.

"I don't think so, because Jiang Lei ...... This one is very similar to that, so ....... ”

"Let's think of going together, it must have something to do with that case three years ago." I said.

Having said that, Cao Yang didn't pick it up, and the two of us each lay on their own single beds. Powerlessness could not be more appropriate to describe both of us here.

I heard him sit up, and I turned my head to look at him. "What, where are you going?"

"I think it's necessary for us to go to Gu Hui's room again."

"You're going to join in this time, too?" There is a slight irony in my words.

Cao Yang ignored my words. After confirming that no one was in the hallway, the two of us quietly sneaked into Gu Hui's room. It was daytime, so it was easy to search compared to last time.

"Crunch~" close the door. The first thing I did was take him to see the teacup set and the brown sugar box that I found last time.

He saw this and completely agreed with my point of view, "Yes, this can basically be concluded, let's take a closer look around." ”

We agreed to use the bed as the dividing line, and I surveyed the bed and the door, and he was between the bed and the window. The first thing that catches my eye is the suitcase, which I skipped because I had seen it last night. Next to the suitcase is a bedside table. I walked slowly to the cabinet.

The basic appearance of the bedside table is not different from my room, the cabinet is about the same height as the bed, and it has two drawers. I started with the drawer, and the bottom drawer was empty. Probably because it's too low, and it's also a temporary residence, so I didn't think of this place.

The second is the top drawer, which I slowly open with gloves. There were some daily necessities inside, such as facial masks and paper drawers, and I pulled the drawer to the maximum, and there were a few boxes of medicines in the innermost.

I took out a few boxes and looked at them briefly, although I couldn't tell whether the drugs in them were toxic or not, but I could clearly distinguish them through the packaging. Most of them are used to treat diarrhea, colds and the like. It is also very common to take out medicine for these common diseases when I go out, so I pushed the drawer up when I thought of it.

Finally, there was the contents of the cabinet, a lamp, a roll of tape, and a medicine board. I picked it up, and on the back of the board it was written "Migraine caused by exertion." ”

"It's a medicine for migraines." I muttered quietly. I felt very strange in my heart.

Putting down the headache medicine, I picked up the tape next to it and followed the edge marks to find the so-called "head." "I pulled out a little bit and gently pulled out a large piece of tape. I put my hand on the tape and felt it with my hand.

"It's too sticky." I muttered again.

Cao Yang seemed to hear my whisper. "What's wrong? What was found? ”

"Look." I picked up the medicine board and tape.

"What's so suspicious about this?" Cao Yang was a little puzzled.

"Look at this medicine board, what kind of medicine would you buy if you bought medicine."

"Of course, it's a medicine that meets the standards."

"No, I mean what kind of medicine you're going to buy." I asked.

"Of course, it is a well-packaged medicine, although the efficacy of the medicine does not only look at the appearance, but the appearance of the outer packaging can also determine some." Cao Yang said.

"That's right, you see this is just a pill board. I didn't find this medicine in the drawer or in his luggage last night, so I doubt it. This medicine board was not from the deceased Gu Hui, but borrowed it from someone else. I reasoned.

"It can happen that someone else borrows medicine, but what does this have to do with the case."

"When do you usually drink brown sugar water?" I asked.

"Of course, when you have a headache, brown sugar water is a must for treating headaches after drinking." Cao Yang said.

"That's good, drinking brown sugar water can manage headaches, and this medicine is also for headaches. Do you think this is a coincidence? ”

"Isn't that what happens?" Cao Yang quipped with a Wanwan accent.

"Let's think of it this way, when you feel uncomfortable, do you choose diet therapy or medicine first, I think most people choose diet therapy. But judging by the two missing tablets on this medicine board, the deceased also took medicine. But why was the deceased not poisoned after drinking brown sugar water first? I think probably, the first piece of brown sugar he took was not toxic, but after all, it was dietary therapy, and the headache was not relieved after eating, so the deceased chose to take medicine, but after taking the medicine, in order to heal faster, he drank another cup. I'm a bit risky to think that brown sugar and medicine are borrowed, and whoever borrows it is the murderer. I reasoned.

Cao Yang followed with a look of sudden realization and asked. "And what's the deal with that roll of tape?"

"Oh, yes, yes, and this tape." I picked up the tape. "I just tried to pull out some and look at it, and I found that the tape is very sticky near the "head", what do you think is going on? ”

"The quality is not good. No, it can't be that simple. Cao Yang thought hard, "Could it be that someone has used it?" ”

"That's right, when we pull a little too much tape, we subconsciously stick it back, which makes it less sticky. I just took a cursory look around and there are no places to glue, and besides, do you really stick things with tape anywhere other than your home? I asked rhetorically.

"You mean the murderer did it?"

"That's right, that's all I have to do now." I put the tape on the cabinet. "But I don't know what to do with tape right now, and I don't think it's too sticky, so who would use tape so precisely...... Unless he doesn't want to stick too tightly. I said boldly.

"How is that possible, if you don't want to stick too firmly, it's better not to stick at all." Cao Yang retorted.

I'm also trying to retract this immature idea.

"Da-da-da-da." I heard footsteps outside the door, "Let's go, let's go out for a walk." "I heard Dayu's voice.

"No, you still want to go out when these things happen. I don't dare. This is Deng Chen's voice.

Then I heard Lao Huang's voice again, "You have two teammates dead, let's be honest." ”

I was afraid that they would break into the room, so I took advantage of the noise outside the room to the door, put my hand on the counter button, and pulled it with force. I only heard a "pop" and the door was locked. Immediately follow with the release of the anti-lock button.

As I let go, I felt a strange and sticky feeling in my hand. Could it be that my hands are sweating too much from the heat, but this is what I thought to myself in the house.

"Could it be ......," I muttered quietly.

I came to Cao Yang's side in a few big strides and motioned for him to be quiet, and there was someone outside the house. After ten minutes, the voices outside gradually died down before I spoke.

"I know what the tape is."

"What?"

"It's the door lock, I just felt the door lock sticky on it. I doubt ......"

"And then ......"

"Uh-huh...... I don't know about this yet. My face flushed.

"Alright, let's get here today, let's go back to our room early. In the evening, let's go and ask them who has brown sugar and headache medicine, and we'd better practice how to get their words out. ”

I hummed, and we made sure the hallway was empty. I kept staring at the anti-lock button on the top of the door......