Fortunately, the hotels in London are not very high, and the height of the 5-story building is not enough for the two people who are taking the potion, and they immediately hang the rope slowly, mainly because they are afraid that the inferior flying tiger hook is not reliable, and they dare not use too much action.

At dinner, Fang Yu asked for the key to the mpV and told the driver not to get out of the car the next day, and at this time he drove the car all the way towards Cambridge.

Cambridge University is not close to the city of London, about an hour's drive, Fang Yu drove the car fast, and when he hung up at 11 o'clock, he had already arrived at the gate.

The whole of Cambridge College was shrouded in darkness and looked very solemn, with the occasional sporadic light of a few sporadic lights, about the students who stayed up late to rummage through the materials in the library.

The two of them parked the car, and with the memory of the day, quietly went to the other side of the gate, and carefully looked around, there was only a low wall, let alone a probe.

"Alright, that's it, let's go in and talk about it." Fang Yu jumped lightly and jumped into the wall.

Zhao Bin followed, and the two entered the academy, and soon came to the door of Trinity College along the route of daytime play.

"Pair the table." Fang Yu looked at Zhao Bin behind him.

It was 12:25 a.m., and the two of them didn't know how often the security guards patrolled here, but with such a large school, it was absolutely impossible to do it once every half an hour.

Therefore, the two of them also boldly infiltrated Trinity College, and when they came to the apple tree, the system really called again, and he was prepared to start the vibration in advance.

"Damn, it won't be under the apple tree, is this going to dig up the roots of the tree, if you let the school know, it will probably turn the sky upside down." Zhao Bin pouted his teeth and looked at this world-famous tree in embarrassment.

"How is it possible, how big is this apple tree, even if it is planed, it can't bring much soil, since it is the source of wisdom, eighty percent is related to books, let's go to the collection on the side to take a look." Fang Yu pointed to the building on the side.

"It's all here, take a look." Zhao Bin nodded and agreed.

The two of them looked around, these buildings have an ancient and long history, so they are not difficult to climb, the walls are rough and easy to get down, and there are reliefs around to borrow.

There were no burglar-proof windows here, so the two of them effortlessly climbed up to the second floor and turned on the flashlight, which was known from the daytime information that this was a Trinity College collection building, which was used to store some precious historical documents, such as Darwin's theory of evolution, or Hawking's manuscript of the black hole theory.

"Be careful, there won't be any infrared, right?" Zhao Bin said in a low voice.

"Damn, I've watched a lot of action movies, how can it be so advanced, but I guess there must be an alarm system, but I don't know where it is." Fang Yu's movements also became cautious.

The two of them borrowed a flashlight to move around the museum little by little, relying on the language talent medicine, and they were able to understand all the words.

"This is where the documents of the college's graduates are stored, I don't think it's here." Fang Yu pointed to one of them.

"It's certainly not here, it's the printing room." Zhao Bin also shook his head.

The time soon came to 1 o'clock, the sound of leather shoes sounded in the corridor, it seemed that the security guard at the door began to patrol, the two quickly opened one of the doors with lead wire, dodged and rolled in.

Sure enough, a security guard casually hummed a little song, and casually shone a flashlight on it, and went to the third floor.

This building only has 4 floors, Fang Yu and Zhao Bin just turned up the second floor, and when they saw that the security guard was gone, he quietly made a gesture to Zhao Bin,

"Keep up with him!"

Fang Yu decided to follow the security guard, he wanted to see which room this security guard paid the most attention to!

In order to reduce the sound of footsteps, the two deliberately wrapped strips of cloth on their shoes before coming, and at this moment they also tiptoed behind the security, after all, this is a foreign country and the world's top university, so it is not easy to make a move.

Sure enough, when the security guard came to the fourth floor, he took out another set of keys, the fourth floor is a separate area, and an iron door needs to be opened to enter.

The security guard seemed to be very careful, opened the door and closed it again, and then continued to patrol, and the two waited patiently for a while, and after about 15 minutes, the security guard walked down slowly.

"Okay, don't look at the rest of the place yet, go straight to the fourth floor!" The two waited for the security guards to go downstairs, and when the sound of leather shoes disappeared into the museum, they felt for the lead wire and poked it into the keyhole.

The lock of the iron door was not difficult to open, and after two minutes, only a "click" was heard, and the door opened.

The two of them carefully matched the time again, it was 1:20 a.m., and the security would not come again for at least 40 minutes.

"Hey, the fourth floor is so big, I thought it was a room." Zhao Bin lowered his voice.

"Well, it's harder to get a big one, we don't know what we're looking for." Fang Yu scratched his head, but he also had no clue.

"Since it's an apple tree, I'm sure I'm looking for something about Newton."

"What if not, the system will never tell me who to call, what if someone else reminds me?" Fang Yu retorted.

"Forget it, let's have something to fight about, let's find out what we have first." Zhao Bin waved his hand and motioned for the two to split up.

Fang Yu thought about it, but still closed his mouth and nodded, and with Zhao Bin, head to end, with the faint light of the flashlight, he began to rummage through the cabinets or drawers among them.

Time passed little by little, Fang Yu found some rare documents, but he didn't dare to take the initiative to try it with his own blood, leaving traces was always not a wise choice.

"Eh, come here, there's a dark compartment here!" Zhao Bin shouted in a low voice in the distance.

Fang Yu's spirits perked up, and he quickly moved to the other side, and sure enough, under the light of the flashlight, a delicate dark grid appeared in front of them.

"There's a lock, Zhao Bin, you go to the staircase and look at it, don't wait a while for the security to come up." Fang Yu rubbed his hands and took out the lead wire again.

Zhao Bin nodded, and said uneasily,

"Hurry up, hold on, I'm afraid the security guards will come in an hour."

He waved his hand, signaling Zhao Bin to hurry up, and then poked the lead wire into the keyhole, according to the talent brought by the potion, he felt that this secret grid was not simple, it was not a modern lock, but some years.

", what's this?" Fang Yu wiped the fine sweat from his forehead, and just as he was about to continue stirring the keyhole, he accidentally found that there were some words engraved on the edge of the keyhole, and there was a layout similar to a nine-square grid above the text.

In a curious heart, he looked at the words, and it turned out that the key to open the secret grid was stored in the nine-square grid, and it could be obtained by solving the problem.

As for the payment, it is the famous Isaac Newton!