There are not many rooms on the second floor. Apart from the bedroom and study, there is only a fairly spacious bathroom.

Hattori Heiji was puzzled by the fact that he had searched all three rooms without finding anything. He was about to go downstairs to meet up with Brother Ying Si when he suddenly remembered the scene he had seen when he walked around the room.

That’s not right. From the outside, the second floor looks quite large. How could there be only three rooms?

Is there a darkroom?

Thinking of this, Hattori Heiji hurriedly started knocking on the wall, and finally found a flaw in one of the walls of the study. He moved the bookcase and found that there was a secret door hidden behind it. There was a portrait of Negishi printed on the secret door, and his full name was written in the lower right corner: Negishi Akio.

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I didn't expect this guy to be so narcissistic.

Hattori Heiji didn't rush to open the secret door, but ran to the stairs excitedly and shouted downstairs:

"Brother Yingsi, come up quickly! We found something!"

Fujiwara Yu went upstairs and followed Hattori to the study. When he saw the secret door hidden behind the bookcase, he couldn't help but give him a thumbs up.

After the two of them pushed the secret door open, they found a room with an area of ​​about 20 square meters. Three walls were made into display cabinets, on which were placed puppets of different sizes and shapes... They looked creepy.

Fujiwara Yu picked up one of the puppets. There was a label on the bottom of the puppet's feet that read: 0.8kg.

"Brother Takashi, these labels seem to refer to the weight of the drugs hidden in the puppets. This one is only 0.2kg, so the price is relatively cheap." Hattori Heiji came to this conclusion after looking at several puppets.

"Well, it certainly looks like that."

Fujiwara Yu put down the puppet and looked around, finally locking onto a beautifully crafted metal box. There was a brown stain on the sharp corner near the bottom of the box. As an experienced criminal policeman, he could naturally tell that it was dried blood.

After he opened the box, he found a cowhide notebook inside, which must be the notebook for recording the customer list.

The contents of the notebook only cover this year's issues. It seems that Negishi replaces his notebook with a new one every year. The previous years' contents may have been destroyed by him. It can be seen that he is a very cautious type.

"3kg from Fukuyama, shipped on February 19th... 18kg from Kameyama, received on February 24th... 5kg from Miwa, shipped on March 10th... 12kg from Kameyama, received on March 15th... It seems Negishi isn't just selling marijuana, he's also buying it at a low cost and reselling it."

Hattori Heiji came forward to take a look, frowned and said:

"Why are they all surnames? There's no way to find out who the buyer is."

"This matter can only be left to the Drug Enforcement Administration to investigate further. All we can do is report the information we have. And I think this is the scene of the first crime. There's blood on the box. Maybe the murderer used it to knock Negishi unconscious."

"That's a bit strange. Why didn't the police handling the Negishi case find any injuries on the victim's body?" Hattori Heiji asked somewhat puzzled.

Generally speaking, the part hit must be the head. Did the police simply hastily determine the case as suicide without considering the possibility of homicide?

Fujiwara Yu shook his head. Although he had thought of this, he couldn't think of a reasonable explanation. He shook the notebook in his hand and expressed his thoughts:

"It's possible the police didn't conduct a thorough investigation at all. The previous two suicides led them to subconsciously believe Negishi also committed suicide. Furthermore, Negishi lived alone, and his parents' portraits were displayed in his downstairs living room. Without anyone to reopen his case, it's natural no one would re-investigate it."

"I see. But Brother Takashi, I still don't understand why the murderer sent the letter of commission to us. If he hadn't sent this letter, Mr. Shinichi's death would most likely be treated as a suicide case. Wouldn't that be bad for him?" Hattori Heiji really couldn't understand the murderer's actions. Did he really just want to provoke Brother Takashi?

Fujiwara Yu shrugged his shoulders to express his confusion. He was never interested in the murderer's purpose when solving cases. Even if the murderer wanted to provoke him, he just had to find a way to ruin his wish.

He glanced at the time displayed on his watch and was about to say that it was time to go back when Hattori's cell phone rang. This frightened Hattori Heiji and he shouted as soon as he answered the phone:

"He Ye! What happened?!"

On the other end of the phone, Toyama Kazuha felt that her right ear had temporarily lost hearing. She switched the phone to her left hand and rubbed her poor right ear while explaining:

"I'm fine. I just found out something that I think might be related to the case. But I went to the living room to look for you and didn't see you and Yingsi-nii, so I had to go back to my room to make a phone call."

"Back to the room?"

Hattori Heiji's focus was not on the case at all, but on hearing the key word "go back to the room". Could it be that this idiot is alone again?

"I'm referring to Sae and Emi's room. Don't worry about me. They're both asleep now. I need to speak quietly to you. Wait a moment. I'll go somewhere far away from them and talk."

Hearing this, Hattori Heiji finally relaxed. Really, his mood today was like riding a roller coaster, up and down. He stared with half-moon eyes and adjusted the phone to speakerphone mode so that Brother Ying Si could also hear what Kazuha was saying. Kazuha moved away from the children and then whispered in a low voice:

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