Now that I have received the commission, the next thing to do is naturally to investigate in detail.

Anne was a serious stalker, and she began routinely questioning two witnesses to the scene, Hill and Vincent.

"What was Adele doing when it happened?"

"Have a banquet and show off her new wand."

"Banquet? Who were invited? ”

"All of them are members of the Squirrel Club, about 400 people. Most of these people were craftsmen, scholars, and knowledgeable merchants in the city. ”

"Oh. What were you two doing when it happened? ”

"I was talking to Vincent at the time. Vincent said he was going to take me to meet the alchemist's proud disciple, and I was about to say goodbye to Adele. Then I didn't find Adele, so I asked the servant for directions, and learned that Adele had an upset stomach and went to the toilet. So I went to the toilet and waited for someone, and the result was ...... Results ......."

At this, Hill's eyes reddened slightly, and she remembered the miserable picture she had seen in the toilet again. Although she was a little jealous of Adele because of the wand, they had always been good friends. Her friend died tragically in front of her, and she was very sad in her heart.

Anne looked at Vincent again: "What about you, do you have anything to add?" ”

Vincent thought for a moment and said, "I remember when Adele showed her Moon Wand, people were amazed and many people were envious. I vaguely saw a few people with greedy glint in their eyes. ”

Anne perked up: "You mean, this monster is greedy for Adele's wand?" ”

"There's this possibility. In fact, I don't approve of Adele's banquet, it's too high-profile. Vincent sighed repeatedly.

Anne asked, "Do you remember the faces of those people?" ”

Vincent shook his head: "I don't remember exactly. I wasn't a member of the Squirrel Club, and I didn't know anyone at the banquet, and I didn't really care much about it at the time. Because the sudden sight of priceless treasures shows that greed is human nature. ”

Anne nodded in agreement with Vincent.

After pondering for a while, Anne turned to Rosen and said, "There is too little information, and if I want to find clues, I have to go to the Earl's Court in person." ”

Rosen immediately said, "Let's go together." ”

Anne hurriedly waved her hand: "No, I'm just going to investigate the scene." Now the Earl's Court must have been cordoned off by the vigilantes. It's inconvenient for two people to go, but I can sneak in and check it out alone. ”

Rosen thought about it, so he nodded in agreement, and he instructed: "You bring a good guy, in case it doesn't feel right, don't fight hard, come back immediately." ”

"No problem. I'll be back when I'm done. 1 hour is about the same. Anne nodded, nodded to Vincent and Ciel, and hurried out of the study.

In the study, Vincent and Ciel still looked a little uneasy.

Rosen took the red wine and wine glass from the wooden cabinet behind him, poured a glass for the two of them, and poured half a glass for himself, and after taking a sip, he said: "Don't worry, Anne will definitely find out the clues of the murderer." ”

The two of them nodded blankly, both of them looking absent-minded.

Rosen asked again, "Miss Hill, may I ask a question?" ”

"Huh?" Ciel came back to her senses, and she nodded, "You ask." ”

"You've mentioned the Squirrel Club many times, what kind of organization is it?" Rosen was curious about this, and in the game, he heard the word squirrel many times, but whenever he tried to dig deeper, he never found any clues.

Hill smiled awkwardly: "Actually, it's not an organization, and it hasn't been established for a long time, only half a year." Usually, it's a group of magic enthusiasts who get together to discuss problems. By the way, I went to the house of a rich owner to eat and drink. ”

"Like Miss Adele?"

"Yes." Hill was even more embarrassed.

"What are the general issues discussed?" Rosen asked seriously.

Hill thought back for a moment and said, "In the beginning, it was all about magic, but gradually, the scope began to expand, and now, the members of the Squirrel Club discuss anything. As long as it is a problem encountered in life, it will be brought out and communicated, hoping to find a solution. ”

Rosen became more and more curious: "For example? ”

Hill thought for a moment, just remembered the question he had talked about with Raphael before, and blurted out: "For example, the problem of natural catenary." ”

"Natural catenary?" Rosen's eyes lit up, he had heard similar problems on Earth.

Seeing that Rosen was interested, Hill took out the silver necklace around his neck and gestured, "This question was raised by Raphael first. Raphael specialized in human sculpture and painting. He has a very strict personality and knows the distribution of human bones, muscles, and fat very well. As far as I know, he went to the cemetery to steal corpses when he was young. ”

"Interesting." Rosen was intrigued.

Stealing corpses was done by many people during the Western Renaissance in the modern era, and some people didn't understand it, so they called these people evil necromancers, but in fact, these people just wanted to understand the structure of the human body.

"Now, Rafael has a problem. He found that he was unable to accurately draw the shape of the necklace around the necklace of the noblewoman's neck. For this reason, he pinned his hopes on mathematics and turned to many mathematicians. Unfortunately, no mathematician can solve this problem. ”

Rosen nodded again and again: "Hmm~ This is really a real mathematical problem, and it is very worthy of further study." But if you want to really solve it, you have to have a very deep foundation in mathematics. ”

Hill agreed: "That's what the mathematician Vicky said. He found the problem so difficult that he even suspected that it could not be solved mathematically. The best way to draw a catenary accurately is to use a solid necklace. ”

"Haha, interesting, that's a good idea. It's just that I have to make a model every time, which is a bit troublesome. Rosen laughed.

"Who's to say it isn't." Hill agreed, and she didn't expect any answer from Rosen, who looked so young.

As a result, as soon as she finished speaking, she heard Rosen say, "I'll try it." ”

"You're coming?" Hill was stunned.

On the other side, Rosen had already picked up a quill, wrote and drew on a piece of parchment, and then said nothing.

Hill was stunned, she turned her head to look at Vincent, and said softly, "This Mr. Lawson is very proficient in mathematics?" ”

Vincent was also a little dumbfounded, he didn't know what Rosen was going to do, so he could only say: "Don't forget, Mr. Rosen is a proud disciple of the alchemy master. ”

Hill was speechless: "Okay. But he's going to hit a wall. At the Squirrel Club, Vicky was a rare smart man, and even my mentor admired his mathematical skills. ”

After saying this, it was only half an hour before Lawson stopped the quill in his hand, raised his head, and handed the sheepskin scroll in his hand to Ciel: "I seem to have found the answer." ”

In fact, Hill is talking about the famous catenary problem in the history of the earth. On Earth, this seemingly inconspicuous problem has caused a large number of smart people, Leonardo da Vinci and Galileo are all confused. Because in those days, calculus had not yet been developed. And once there is calculus, the catenary problem is solved.

Hill naturally didn't know these stories, and she was taken aback: "Ah....... What did you say? ”

"I said, I got the answer." Rosen laughed.

"How is that possible?" Hill stood up, trotted to the desk, took the scroll and looked at it, her face gradually turned red: "Mr. Rosen, you seem to be invoking the very immature concept of 'limit', which doesn't seem to be very rigorous. ”

"Hmm, really? You mean that the mathematical definition of the limit is not clear, right? Rosen asked.

"Yes." Hill nodded repeatedly.

"Judging by the scrolls alone, it is. However, in some of my other notes, I have defined the limits very strictly. I don't have time to expand on it today. ”

"Don't you want to talk about it?" Hill looked confused, it was like smelling the aroma of food, seeing the current food, but not being able to eat it, it was simply torturous!

Rosen didn't seem to want to dwell too much on the concept of limits, and he pointed to the scroll: "Look at the answer, is it what Rafael wants?" ”

Hill could only continue to watch: "Hmm~ You also used trigonometric functions...... This seems a bit complicated, and I can only understand half of it. But judging by the answer alone, this should be what Raphael wants! ”

Rosen put the quill in his hand back into the inkwell and smiled lightly: "Then this parchment will be given to Raphael." By the way, you told Vicky on my behalf to stop calling himself a mathematician. Math wasn't as simple as he thought. ”

"......" Hill was speechless.

She felt that this young man had a very bad personality, not only liked to hang people's appetite, but also had a particularly bad mouth. If he had heard these few sarcastic words, he would probably have the sweet-mouthed little bee to death.

Just then, there was a knock on the door, and Anne's voice came from outside the door: "Rosen, I'm back." ”

"Come in."

The door was pushed open, and Anne walked in with a solemn face, still with a faint smell of blood.

"How?" Rosen asked, and Hill and Vincent looked at her attentively.

"Judging from the clues left at the scene, I'm sure it was the Shadow Demon who did it." Anne said.

"Hiss~ It's really a monster!" Vincent gasped.

Ciel's face turned pale: "How can there be a shadow demon in Nilogaard City?" ”

Shadow Fiend,Good at changing various shapes.,Brilliant intelligence.,Like to sneak attack.,It also has very terrifying frontal combat power.,It's a very difficult monster.。 When a low-level magician encounters them, he doesn't know how to die.

Rosen asked, "Is there a follow-up clue?" ”

Anne nodded: "I traced it all the way and found that he ended up in the Marquis de Pétain's villa of the Black Thorns in the north of the city. ”

"O gods, Marquis of Pétain? Things are getting more and more complicated! Vincent exclaimed.

Unlike Adele's shallow-rooted commercial aristocracy, the Marquis of Pétain is an old nobleman, with fiefs and guards, and has stood in the Kingdom of Cowell for 500 years, and his family power is deep-rooted and intertwined. If the murderer has something to do with the Marquis of Petain, then Adele's revenge will be difficult to avenge.