Xia Lingge sat on the top of the bookshelf and looked at the overall layout of the library, Bai Xi trembled and slowly climbed up, she sat next to Xia Lingge, took a deep breath and asked unsteadily, "What do you see?" ”

Xia Lingge didn't speak, just stretched out his hand and gestured around the library twice, Bai Xi looked a little puzzled, turned his head and looked at the overall bookshelves placed in the library again, the rows of bookshelves were placed without rules, some were too large, some were small, all the buildings in the castle were a rule, and it was indeed a bit strange to put it in a chaotic way like this.

Bai Xi thought about the lines that Xia Lingge had just sketched with his fingertips, combining those lines with the bookshelf in front of him, and suddenly found that it was indeed very interesting, line to line, bar to bar, each column and then combined seems to be able to get two English words 'H' and 'Z', although it is not very obvious to look at the past, but moving up and down the combination can indeed get these two letters.

"But what is the use of these two letters?" Bai Xi turned his head to look at Xia Lingge.

Xia Lingge replied: "It should have something to do with sorting." ”

She had just roughly glanced around the books, and there were countless books starting with 'H' and 'Z', which were not used as references, so she thought that 'H' and 'Z' might have something to do with the order of arrangement.

In the twenty-six letters,

'H' belongs to eight,

'Z' belongs to twenty-six,

Xia Lingge's gaze fell on the layers of wooden planks on the bookshelves, and the longitudinal count could not reach twenty-six at all, at most twenty-four, so this number was very likely to be a horizontal number.

Twenty-six...... Eight......

She turned to Baixi and said, "Go to each shelf and find the twenty-sixth book in the eighth row." ”

Bai Xi seemed to understand after hearing this, she and Xia Lingge went down to the ground one after another, and began to look for the twenty-sixth book in the eighth row of the library, before looking at the library is very large, there are enough books, but after counting carefully, I found that in fact, the bookshelves are not very many, but they are wide enough and large enough to make the whole library look extremely grand.

Xia Lingge and Bai Xi worked together, and the twenty-sixth book in the eighth row found four books, but when they went to find the fifth book, there was an accident, it was empty, and there was nothing.

Bai Xi shook his head: "That's the book that was stolen and didn't get back." ”

Xia Lingge was silent, but he also put the books together with Bai Xi first, all of them were written in English, but according to the general idea, it was obvious that these four books were not close to each other, history, geography, science fiction, and famous novels......

Bai Xi looked at her: "Can you see anything?" ”

Xia Lingge didn't answer her, just closed all the books again, she looked at the covers of all the books and suddenly stretched out her fingertips and pointed, "Look at the initials of these books." ”

‘R’、‘E’、‘T’、‘E’…… In addition, an additional vacancy is required.

Xia Lingge thought carefully: "Is it 'three'?" ”

If you put all the initials in a bind and add a blank, it will match the English number 'three' perfectly.

Bai Xi listened to Xia Lingge's words and saw the clues, but he didn't agree immediately, lowered his head and began to think again: "It may also be 'thirteen'." ”

She took the book and arranged it again: "In Spanish, these letters can also be combined to form thirteen 'trece', which are 'T', 'R', 'E', 'C', 'E'......."

"Equally satisfying alphabetical and one vacancy."

Xia Lingge blinked: "How do you know?" ”

Bai Xi held the book and said with some emotion: "When I was idle in college, I went to watch a Spanish movie with my classmates, the story was very touching and profound, which made me interested in learning Spanish, not very proficient, but there is no problem with counting numbers." ”

Xia Lingge looked at her eyes, her eyes were gentle and did not dodge, and her expression was not like lying.

So now......

Is it 'three' or 'thirteen'?

Xia Lingge was silent, the book that disappeared in addition to her happened to be the key to solving the mystery, I don't know who took it, and I don't know if the person who took the book happened to be unintentional or intentional, but no matter what, it can prove that there is a treasure hidden in this library.

Let's study the 'three' and 'thirteen' first.

Is it still a longitudinal and horizontal search?

No, no game will reuse the same rules, and even if there are, it will happen in different dungeons, and the same mystery in the same game should not be so simple.

So what else could there be?

Xia Lingge opened the book in front of her and began to read it from the first chapter, the author's introduction, the table of contents of the book, and then to the content of the text, she couldn't understand the whole English in the Chinese department, but she had turned a lot of translations when she was in the school library, so according to some word analysis, like history and famous novels, she can follow the general idea, but the rest ......

"It's strange to say."

Bai Xi suddenly murmured: "Generally speaking, the author's introduction will write the date of birth and the date of death, but why is there only a date of death in these?" ”

Xia Lingge looked at it and found that it was really the case, each author's introduction only marked the 'date of death' and there was no 'date of birth', and she looked down the content and her eyes fell on the date of publication.

Suddenly, an idea flashed through her mind.

Is it possible that the 'three' or 'thirteen' is the interval between the date of publication and the date of death?

She got up and looked at the books in the library, and said to Bai Xi, "Check the date interval." ”

The library is huge,

Although they searched quickly, it also took a lot of time, and finally, Xia Lingge found the book with an interval date of 'three' on one side of the bookshelf, which was the book "Norse Gods" that she had put back before, and Bai Xi also found the book with an interval date of 'thirteen' from the other shelf.

But which of these two books contains a clue?

Or which of these two books will help her find the half-mask?

Bai Xi and Xia Lingge respectively took the book in their hands, Bai Xi thought for a moment and said, "Wait a little longer." ”

Xia Lingge was puzzled: "What are you waiting for?" ”

Bai Xi said: "There is only one regulation of the library, to ensure that the books are complete, if not complete, the library will have an 'earthquake' every twenty minutes, but I found that this did not happen when we were looking for alphabet books, and I think the library still connived at revealing the secrets." ”

"Now we each have a book in our hands, as long as we test it with 'earthquake', we can know which book we have in our hands that is a special case."

Xia Lingge thought about it and felt that it was a solution. She was about to ask Baixi when the 'earthquake' would come, and what it would look like when it came, when she felt an unusually violent shaking under her feet.