As night fell, bonfires were lit in the military camp outside the city.

"What is this?" A patrolling soldier found a piece of paper on the ground by the light of a torch.

I picked it up and found it was an envelope.

The envelope was very delicate, sealed with glue, and there was not a single word on it.

He twisted it with his hand and found that there was a piece of letter paper inside, it was not empty.

Under normal circumstances, he would have thrown this thing into the fire without hesitation. After all, he could not read and did not care what was written inside.

But not today, because this was the second identical envelope he had found.

After being reported step by step, the letter was delivered to military advisor Wang Zhaolin.

"Where did you get it?" Wang Zhaolin asked.

"We picked them up from the ground. We found several such letters and either threw them away or burned them. Later, we found that there were more and more letters, and we were afraid that there might be important things in them, so we reported the matter." The soldier replied.

Wang Zhaolin nodded and took the envelope back to the military tent.

Instead of opening the envelope rashly, he put a piece of thick cloth on his hand and then opened the envelope carefully.

After opening the envelope, there was a piece of equally exquisite letter paper inside.

The letter paper was filled with densely written words.

Wang Zhaolin knew every word above, but he couldn't understand them when they were put together.

"What...what is written here? Why can't I understand it?"

at the same time.

Zhang Xianzhong also received the news and was also confused after reading the contents of the letter.

But I soon realized that there was something fishy in the letter.

In his early years, he served as a soldier in Yansui Town, and similar letters were used in the army to convey confidential information.

"If I'm not mistaken, this is a secret letter used by the Jinyiwei to pass messages." Zhang Xianzhong slammed the table, "There is a Jinyiwei spy in the army!"