today's island

After all, it is a newly developed urban area, and the supporting facilities are not very complete. Although the shopping malls and restaurants are basically in place, there is really only one shop selling building blocks, located at No. 20, Ningyang East Road.

"In this way, it is indeed from No. [-] East Road to No. [-] West Road." Wan Yi looked at the route in shock.

"Yeah, so the mystery is completely matched." Lu Yuanzhe braked and stopped on the basement floor of this shopping mall, leading everyone to take the elevator to the seventh floor.

This is a themed mall, and everyone's shops have a sense of fantasy and art. At first glance, it looks like you have entered an art exhibition, but this Lego toy store is quite easy to find.

They stopped in front of this Lego store, which was not very lively during the day, and when they looked up, they could see a painting hanging at the door. The painting was a western-style courtyard with an invitation letter painted on the upper right corner.

They gathered at the door, and the clerk saw them all at once at the cash register. He was a little surprised at first, but then became inexplicably flustered, and lowered his head and stopped looking at them.

Lu Yuanzhe walked into the store alone, stopped in front of the hanging painting, and before he could ask the clerk, the clerk buried his head and walked over to strike up a conversation with him.

"Mr. Lu...is that right?" she asked.

"Yes." Lu Yuanzhe nodded.

"This is a painting sent by someone else. He said... Let me hang it here. If a Mr. Lu comes, you can give the painting to him." The clerk's voice was very low, and he glanced at him timidly.

"This way..." Lu Yuanzhe turned around and made the right gestures for everyone, and then everyone entered the store.

"It's like this... I don't know that it has something to do with the case. They paid us to hang up, and we hung up. I thought it was something like a marriage proposal or a confession. I just saw you and figured it out. "The clerk obviously had seen the video and explained in a panic.

Although the time was a bit urgent, Lu Yuanzhe helped her organize the timeline while Cheng Mo and the others took down the hanging paintings.

About three days ago, they received this hanging painting and a letter from the sender, and directly remitted 1 yuan to their online account in the store. They said that a "Mr. Lu" would come to see the painting in two days and send the painting Just leave it to him.

The money is not earned for nothing, they hung up, and these two days they are still discussing the plot of the rich woman and the little milk dog, who knows that the police are called.

She didn't think about it when she saw the video crazily reposted across the Internet this morning. She didn't come to her senses until Lu Yuanzhe stood at the door of their store.

"The letter..." She looked around hesitantly, "I seem to have thrown it away. I have the transfer account and I can send it to you."

"Understood." Lu Yuanzhe nodded, the hostage was still in Yan's hands, and he didn't intend to waste time with her, "We will send someone to track it down, but we don't have time right now, you wait here first."

The surrounding police were notified to take notes, and they returned to the car with the hanging painting. There was nothing on the painting, only the four corners felt a little thicker to the touch.Cheng Mo cut it open with a knife and found four pieces of broken notes, which could fit together into a complete one.

Without their manual splicing, Yan released a brand new video on the Internet the moment they left the building.

"Special progress broadcast, congratulations to the special case team for finding the clues to the second level." The young master announced to everyone in a correct voice, "Second question - there is a wall five feet thick today, and two rats cross each other. Rat day A foot is a foot, and a mouse is also a foot. A rat doubles every day, and a mouse half a day. Question: Where can we meet?"

The video stopped abruptly after reading the title, and everyone froze for a moment.

"Ah?" Wan Yi was puzzled after hearing the question, and looked up at the others, "What rat? What five feet?"

"This is a famous math problem in "Nine Chapters of Arithmetic." Cheng Mo explained patiently with the calmest expression, "It means that there is a five-foot-thick wall, and two mice are facing each other to make holes. The first day Rats and mice are beaten one foot, and the rats are doubled every day, and the mice are halved every day. Ask, where will we meet?"

"..." Su Xiaozhi, Ding Chenyu and Ling Xi looked at each other without soul after listening.At a young age, who would do this kind of math problem.And Lu Yuanzhe has quickly opened Baidu and gave up thinking.Technology makes people progress and can replace part of the brain power.

"The answer can be calculated, you can use Baidu, you can wait for enthusiastic netizens, but...where is there a wall that is exactly five feet thick? Or...how many?" Thought speculation.

Everyone was lost in thought, Lu Yuanzhe frowned first and said, "I think... the young master wants to test our math?"

"We think so too." Everyone nodded, praying that this wasn't a real math problem.

·

In the process of worrying about this math problem, the fifth video appeared. Today is a cloudy day. It was a short cloudy day at this time, and the light in the room also changed subtly, making it more certain that it was shot in real time.

Sun Yan is still following the usual steps to track down the person who kidnapped Qin Xiaoxin yesterday, but with the remittance records just obtained, they still have no effective clues.

"I have the answer." Wan Yi was broadcasting the progress of the network in real time, "They played for 36/17 days, and the rats played for 59/17 feet."

"What the hell..." Lu Yuanzhe was in a daze when he heard it.

"First of all." Ding Chenyu slapped his hands to attract everyone's attention, "If every sentence in the riddle is useful, then there is no such mouse."

If the idea of ​​solving the problem is the same as last time, then this mouse is also part of the puzzle, and the young master will definitely not use that "Nine Chapters of Arithmetic" for no reason.But now they can't think of any place that can be related to rats, it can't be the sewers.

"If we build a Disney theme park here, we can still consider it." Lu Yuanzhe joked.

Not to mention Mickey Mouse, netizens on the whole network almost turned their heads, as long as they thought of anything related to "mouse", they just couldn't find a suitable entry point.

In the process, the sixth video was also released on the Internet.During working hours in the afternoon, the number of people who eat melons has not decreased at all, and people discuss this math problem in almost all public places.

In the end, Wan Yi found a magical statement on the Internet: "You may not believe it, but there is a place in our island city called 'Wuchi Tea Bar'."

"Huh?" Everyone looked at his mobile phone together.

This is a piece of local information, and the blogger said casually that he didn’t know how to solve this math problem, so he just posted this place with text—I found a five-foot one.

Not only him, it seems that several people have noticed that when a meme is being posted, the owner of this shop has appeared and posted the sentence "I'm going to be popular".

Because he found the information about this store, Lu Yuanzhe made a phone call. He was supposed to be a dead horse doctor, but as soon as he got through the call, he just explained his identity, and the owner answered the call enthusiastically.

"To be honest... I think you should come and see me. Although I don't know if it has anything to do with me, my son is indeed a rat."

"Isn't it a coincidence?" Lu Yuanzhe was stunned for a moment, and motioned Ding Chenyu to drive to the address given by the boss.

There were already some bored people eating melons, but there were far fewer people than at the first stop.Firstly, there are still many people who don’t know about this “Five Foot Tea Bar”, and secondly, the enthusiasm for field visits has declined.

The boss welcomed them in enthusiastically, and Lu Yuanzhe asked about it. He didn't receive a letter, didn't receive a strange phone call, no suspicious person appeared, and no hole was punched in any wall.

The only thing that can be related is that his son is a rat. Although it is indeed a coincidence, it doesn't seem to be a hint.

Moreover, even if they found it, they did not find the remaining relative words of this topic.

"How about...call your son?" Lu Yuanzhe also asked casually.

"I found a... hole?" Su Xiaozhi suddenly pointed out the window, "Is that a hole?"

It was indeed a hole, just where I could see it from sitting in this store. It seemed to be a disused rainwater drain, and now I could see a conspicuous ball of waste paper inside.

Passers-by will definitely not notice this location, only they will seriously think about whether there is a "hole" here.

Lu Yuanzhe went out from the store and pulled it out. It was a brand new newspaper with a small note inside.

The moment he took it out, he took out his phone and refreshed Weibo.

The moment he took out the note, Yan really updated the latest video.He looked around, there were many buildings, and he didn't know where the other party would be spying.

He took the note and reported the tea bar to the nearby police station for on-site inspection, then called everyone back to the car and clicked on the video.

The young master walked in front of the camera for the third time, cleared his throat, and patted the question board on the third page like a teacher knocking on a blackboard.

"At what hour and where can you see the sunshine like Morse code?"

The topic this time is simple and can be understood at a glance.But it's useless if everyone understands it. Although it is cloudy today, it is not possible to see the sunshine like Morse code.

"Is there any building that can reveal a row of sunlight of different lengths?" Ling Xi asked.

"It's not that you can't find it, it's too much." Ding Chenyu drove forward, and at this time motioned everyone to look out, "Look, as long as it is a building area, it can show you sunlight of different lengths."

"Besides, what is long and what is short?" Wan Yi looked at these buildings of different widths. Even if they had certain specifications, they would not be exactly the same. see."

"It won't be these ordinary business districts." Lu Yuanzhe shook his head, "Think carefully, there is something very special about it."

"Maybe I know where this is." Cheng Mo waited for them to finish talking before opening his mouth, and handed the address to Ling Xi, the co-pilot, and asked him to guide Ding Chenyu.

"What kind of place is this?" Ding Chenyu asked with a glance.As a local dating fanatic, he didn't even remember where this place was, he could only judge from the location that it was in the suburbs.

"I haven't seen it either." Lu Yuanzhe could be considered a tour guide in the island city, and he didn't recall what this place was. Cheng Mo, an otaku who doesn't go out very much, how could he know such a place?

At this time they received the seventh video, half of the time had passed, and the sunlight outside the window had begun to slant westward, but Cheng Mo was very confident: "Master must still have a second hand, so I'm afraid we won't be able to solve the problem, so I buried a reminder for us." .”