"That's the way it is, I don't have any clues at the moment." Yan Shi didn't hide it from Tang Xiaotang, after all, among the people he knew, she was the smartest. I thought about asking her for help before, but I felt that it would be very costly.

Tang Xiaotang: "Alas, I'm really worried about the safety of the citizens of Sakura, you still have to think about such a simple question for so long?" ”

Yan Shi: "Huh? Is it simple? This person has never shown up, I don't know if it's a man or a woman, even if I can deduce that it's from this school, how can I find so many people in this school? ”

Tang Xiaotang: "You're not too stupid, at least you know that you come here to find a book, the key point is indeed the lost and found, think about what you just said, the location of each transaction is different, just because the people behind the scenes are afraid of exposure, but there is only one place that is the same every time, that is the lost and found, if I guess correctly, every time this person wants to trade, he will deliberately put a book with a code in a random place in the school, and wait for someone to pick it up and send it to the lost and found, after confirming that the book was picked up and sent here, The payment code will be pasted to the place specified in the code, and the drug will be placed in the place corresponding to the code of another book. After confirming that the money has been received, find a way to send the second book to the lost and found. After all, you have to ask the other party to confirm that you can receive the book the next day, so there is a high probability that you will leave the book near the lost and found office for the second time. ”

Yan Shi: "Eh, so what?" ”

Tang Xiaotang: "It's really stupid, don't say it's my servant in the future, what you should do now is to decipher the code in the book and return it, and then go to the designated place to check, if there is no collection code, just wait there for someone to come and paste the code, if there is a collection code, then pay, and then go to the lost and found, etc., there is a high probability that you can catch it." And I guess this person should be acting after school, after all, there are too many people during the day"

Yan Shi: "I understand, I'll contact Chen Yan now." ”

Tang Xiaotang: "Why did you contact her, don't you think this matter is very exciting?" Since it's a school thing, it should fall within the scope of our Mystery Research Society, and it just so happens that we haven't done our club activities this week. ”

Yan Shi thought about it, it is true that everything is just speculation now, there is no need to alarm the police, and even if Chen Yan is told, the other party can't control it in the school so as not to startle the snake, and in the end, he has to help Chen Yan do this by himself, it is better to wait for the results to contact her.

After school, Yan Shi found Hoshino Butterfly: "You and Tang Xiaotang should go home first, I still have something to do." ”

Tang Xiaotang: "I want to go too, the solution is what I came up with, and I must be taken there." ”

Hoshino Butterfly: "Where are you two sneakily going, aren't you going home?" ”

Yan Shi: "Well, club activities." ”

Hoshino Butterfly: "Am I not a member of the club?" Why don't you call me? ”

Yan Shi: "That, the last time it was already quite dangerous, I suggest that I act alone, and I will sort out a report for the two of you to watch afterwards." ”

"No way!" Tang Xiaotang and Hoshino Butterfly said in unison.

Yan Shi: "Okay, but you two are not allowed to shout, and you are not allowed to expose your actions." ”

The three of them came to the designated place of the code and found that the collection code had been posted here.

Yan Shi: "Eh, what should I do?" ”

Tang Xiaotang: "Let's pay first." Then go to the lost and found office near the squatting point, see if anyone comes to deliver the book, you may not be able to go home tonight, you may stay up all night, Hoshino butterfly, do you dare to participate? ”

Hoshino Butterfly: "You dare to participate, what am I afraid of?" ”

Yan Shi: "Then the two of you are watching, I'll go back, and come over for you in the middle of the night?" ”

"No way!" The two said in unison again.