Wu Tongguang and Li Wutong didn't dare to speak loudly, and the secret passage kept spiraling downward, only to hear the sound of boots on their heads, and it seemed that they had gone to the depths of the study.

After walking for a while, they couldn't hear Lin Yutong's noise, a stone room appeared in front of them, the passage was crowded for a long time, and the two of them suddenly had a feeling of enlightenment.

The stone room is square, there is a stone table in the middle, and there is a book in the upper right corner of the stone table, Wu Tongguang touched it with his hand, only to find that the book was not a real book in front of it, but a special line of iron and stone poured on the stone table that was inseparable, and the stone table was connected to one.

"What is this?" But he was not suspicious, it was normal to pour small ornaments on the stone table.

On both sides of the stone table, two stone slabs are carved with words, about the same height as Wu Tongguang, the left side is carved with words: "all bodies turn back", and the right side is carved with words: "Standing on the ground to become a Buddha".

Li Wutong said: "This place, isn't it the place where Master Huiyun participates in meditation?" ”

Wu Tongguang shook his head and said, "I don't see it." ”

Li Wutong was a little scared, and said: "I feel that this house is full of strangeness, and we don't know who took the lead and covered the eight-character telegram translation with the calligraphy and painting in your hand." ”

Wu Tongguang breathed a long sigh of relief and said, "At least we don't have to hide from Lin Yutong's gang of people from the Party General Bureau now, and we don't have to hide from the female spy who has good kung fu behind, we can do something to chant poetry." ”

Li Wutong snorted and laughed: "It's a shame that you can still make jokes now, and you can come up with such an elegant puzzle, what kind of comrade are you saying lurking around Fu Zuoyi and Li Mingding." ”

Wu Tongguang spread his hands and said with a smile: "Only such an elegant and famous comrade Li Wutong can decipher this riddle in the mystery." ”

Li Wutong listened to him use the things he had pretended to play before, he didn't get angry but laughed, stretched out his hand and clasped his fingers and flicked lightly on Wu Tong's bald head: "This girl can't do it, I can only look at our big martial arts!" ”

After the two fought for a while, Wu Tongguang put on the stone table, took out a collection of poems, and once again unfolded the whole picture of the poems.

Wu Tongguang muttered: "What does it mean that such verses are hidden in the half-cut book left by Lei Yin? ”

Wu Tongguang gently flipped the poetry book on the table, and said to Li Wutong: "This book turned out to be Master Huiyun's poems, you see ......" He pointed to the first few pages, and his beautiful handwriting copied another more famous poem by Master Huiyun, "Farewell Song": "Outside the long pavilion, by the ancient road, the grass is green......

Li Wutong listened to Wu Tongguang's eloquent words, and couldn't help but be fascinated, and asked after a while: "Could it be that this collection of poems has also been specially treated, and the words can be displayed in it?" ”

Half of the book is clearly written in invisible ink.

As for whether the poetry collection in the hands of the two people has also been written in invisible ink, it is unknown.

However, the crux of the matter is how to test whether the poetry collection has been written in invisible ink. Wu Tongguang accidentally stumbled, hid half of the book in his arms, and wrapped himself in the dress of a martial artist to avoid Lin Yutong's pursuit, which made the half of the book show the words.

The so-called invisible ink is just the use of acid-base indicator chemical change reaction, the written handwriting is hidden, and then encounters specific reduction conditions, and shows the handwriting tricks, the earliest is the unique work of some small magicians who walk the streets, and it is indeed more popular in the early days of the Republic of China.

The key to revealing handwriting is to understand what reagents are used to process the handwriting, some invisible inks use redox, while others use precipitation, and some gradually reveal the characters with the passage of time when the ink effect weakens.

At that time, the half-cut book was just an unexpected gain, and now there is no hidden character in the poetry collection in my hand, and how to make it visible?

"Is it temperature? Humidity? Or is it time? ”

Li Wutong said: "I can't get used to seeing you scholars grinding and chirping, you will know if you try the method!" Come on, take it to the candle and bake it first, maybe it will be revealed, I have seen such a scene in the play. ”

Wu Tongguang shook his head and said: "It's better to be cautious, if you don't know the method of displaying words, try it randomly, and bake it on the fire If the characters come out, it's okay, but if it destroys the foundation of the original characters..... I'll take a look at it first. ”

Wu Tongguang took out half of the book, compared it with the poetry book on the table under the candlelight, and there seemed to be a flash of inspiration in front of him, and he exclaimed: "Ouch, Wutong, look! ”

"What's wrong?"

The poems copied from the book left by the man with gold-wire glasses, that is, the half-cut book of the visible characters, are exactly the same as the "Guiyan" in the poetry collection.

Same.

"Well, it's the same poem."

"No, look at it again, it's not just the same poem."

Even the handwriting is exactly the same!

In this way, the direction of judgment should not be wrong, Lei Yin not only went to Nanjing before his death, but also copied a collection of poems in the former residence of Master Huiyun, and this collection of poems is his handwriting.

At that time, he was already under siege, and there was a top killer Zheng Biwan by his side, so it was unlikely that he would carry this important situation with him.

In other words, it is likely that Lei Yin had hidden this extremely critical information that needed to be protected with his life "beforehand" in a place related to the poem.

And the blank book he carried with him left a clue that his comrades could find the poetry collection here of Master Huiyun.

What kind of intelligence, so important and secretive?

Li Wutong asked: "Since the superiors said that it is related to the war situation in the north, could this be a battle plan or a defense map or something like that?" ”

Wu Tongguang said: "It's hard to say now...... "If it is the enemy's battle plan or defense map, after knowing that Lei Yin has stolen secrets, the enemy will have time to change the battle plan or adjust the strategy.

"Our main task now is to decipher the secrets of this book as soon as possible."

Wu Tongguang muttered: "It's better to go back to your hometown mountain...... What a meaning of leaving the world and escaping from Zen. ”

Li Wutong held his chin with one hand and looked at Wu Tongguang in a daze, unwilling to disturb, but seeing that under the candlelight, Wu Tongguang's face was reflected with a faint brilliance, which was both soft and bright, and his facial features were particularly good-looking.

I really didn't expect that in the days of war and chaos, the two of them would have a moment of peace in such a secret room.

Li Wutong simply didn't think about it, and just quietly accompanied Wu Tongguang.

A woman like Li Wutong, the long-term revolutionary struggle, has long created her strong and brave temperament, born in the mountains, although she has no cultural knowledge, but also accumulated rich social experience.