"Shuichi-kun, shall we go back now?" After saying goodbye from the Yamaguchi Police Department's home, Kanako saw that Lin Shuichi suddenly became silent, so she broke the oppressive atmosphere in the car by asking about the next arrangements.

"If it's not troublesome, I still have a place I want to go!" Lin Xiuyi woke up from his thoughts, and he realized that he had been immersed in the case and ignored the feelings of his fellow traveler Kanako.

But what can be done about this? When he left his home at the Yamaguchi Police Department, Lin Xiuyi was given a complete copy of the police information about the Futu Temple case. As a police officer, Lin Xiuyi can especially understand the feelings of a retired criminal policeman when he quietly keeps a case that he can't solve. Chiaki Yamaguchi did this out of great guilt for his victims. Even if he might cause himself a lot of trouble by handing over this information to someone other than the police without authorization, he didn't want this case to lie in the filing cabinet of the Yamanashi Prefectural Police Headquarters forever and continue to sleep.

Hayashi Shuichi followed the directions of the navigation and drove the car to the Yamanashi Prefectural Archives, where he showed his police journal to the library staff in front of Kanako. Although Kanako had long been suspicious of Lin Xiuyi's identity, Kanako was still taken aback when she saw the police handbook.

"A lesson from the Metropolitan Police Department!Lin Xiuyi!Police Department supplement?," Kanako asked curiously. It's not true that the police department is making up for it at such a young age!

"I'll talk about this later, I want to investigate the archives about Futu Village in recent years, do you remember that Yamamoto Kengo once mentioned that in the most difficult time after the war, there were villagers who picked up Jin Xiaoju in the wreckage of Futu Temple? And later the media also reported that someone had picked up Jin Xiaoju in the stream near Futu Temple! This tells us one thing, at least the treasure matter is not groundless!"

Lin Xiuyi took advantage of the staff to leave and whispered to Kanako.

"Then you mean that Ayu's death could have something to do with the treasure?" Kanako asked in surprise.

"I do have this idea, the Yamaguchi Police Department told us that Ayu is an unmarried woman and has a fiancé in her hometown! And after the case, the Yamanashi Prefectural Police investigated Ayu's fiancé and confirmed Ayu's fiancé's alibi. So I think that in terms of the motive of the crime, the possibility of love murder is not great!" Lin Xiuyi continued to explain to Kanako.

"So what are you going to start with?" Kanako asked curiously. At the moment when Lin Xiuyi revealed his identity, Kanako already realized that this was a rare learning opportunity, after all, the screenwriter of the TV station does not always have the opportunity to experience the search process up close with the police. And a police officer like Lin Xiuyi who is willing to share his search ideas is even more unique. The police have always regarded the media as their natural enemy, fearing that their counterparts would disrupt the search and interfere with the work of the police. And this time, it is definitely a once-in-a-lifetime opportunity to be able to follow Lin Xiuyi to continue to track down the murder in the secret room of Futu Temple 10 years ago. Kanako is glad that she didn't get the answer to the shoe print puzzle and goes straight back to Tokyo. Her support for Lin Xiuyi has brought her a greater reward.

"Investigating killings, in terms of motives, can basically be divided into several broad types. In view of the age of the victim Ayu, the first thing I considered was emotional entanglement, which is commonly referred to as love killing! The Yamaguchi Police Department had investigated Ayu's fiancé, which means that the Yamanashi Prefectural Police had followed the clue of love killing. Judging from the results, it seems that it may be difficult to get through this direction......" Lin Xiuyi patiently analyzed for Kanako, and Kanako couldn't help nodding.

"The next thing I ruled out was the murder of passion! Because the scene was arranged as a closed secret room, it can be seen from this that the murderer was very calm! If my guess of the footprints is correct, he did not flee from the Buddhist hall in a panic after killing the deceased Ayu. Instead, the murderer patiently waited for Kengo Yamamoto to go up the mountain, and after Kengo Yamamoto found the body and went down the mountain to call the police. Unhurriedly followed Yamamoto and fled the scene of the crime, and this courage and resourcefulness alone is not the kind of guy who recklessly kills people......"

"Among the remaining concentrated motives, I am more inclined to commit murder. Do you remember the murder weapon that killed Ayu? It was a rib handed down from the Warring States period, and it was worth a lot of money......"

As soon as Lin Xiu's words fell, the staff of the archives returned to the counter. After confirming Lin Xiuyi's identity, they began to retrieve all the information about Futu Village from the computer according to Lin Xiuyi's request. After Lin Shuichi and Kanako thanked him, he walked into the access area that was not open to the public, and then sat down in front of the computer and got busy.

Lin Xiuyi first opened the police plan file handed to him by the Yamaguchi Police Department. This information is much more complete than Kanako's. Among the materials were pictures of each piece of evidence found at the crime scene, the location of the body of the deceased when it was found, and Lin Xiuyi's first concern was the traces of footprints.

Lin Xiu stared at the photos of the snow footprints on the scene seriously, and quickly gave up his original idea.

The footprints on the photograph are crystal clear, with no overlapping traces. In addition, there is a photo of the shoes that Kengo Yamamoto was wearing at the time, perhaps because he often walked on mountain roads, and Yamamoto's shoe print had a large patch of obvious wear on the outside of the forefoot. And the position of wear in the average person is in the position of the back heel. This feature is also fully reflected in the photographs of the footprints.

"It seems that I still take it for granted, things are really not so simple!" Lin Xiuyi said to himself.

"Shuichika-kun, did you find anything?" Kanako asked on her own initiative.

"The footprints are clear, and there are no traces of re-stepping on them, so my assumption is not valid, it seems that we are back to square one!" Lin Xiu pointed to Kanako to a few worn marks on the soles of Yamamoto Kengo's shoes, and then compared them with the footprints on the snow. Even a layman, Kanako, quickly saw the doorway.

"So what should we do next?" Kanako asked anxiously.

Lin Xiuyi was not annoyed that his assumptions were overturned, but instead replied confidently: "I want to check out the treasure of Futu Village, do you remember the reason why Yamamoto Kengo told us to rebuild Futu Village? When the village needed it most, a few gold judgments actually appeared like this? Don't you think it's a bit too deliberate? Now we already know that the treasure once appeared in the wreckage of Futu Temple and in the stream below the mountain. But why didn't there be rumors of a treasure in the process of rebuilding the temple? And I suspect that the Warring States period rib on the chest of the deceased Ayu is actually part of the treasure!"