The staircase is narrow enough for only one person to pass through, and the long stretch seems to have no end in sight. The oil lamps on both walls were lit up and illuminated through.

When I arrived, it was a heavy iron gate. In the middle is a huge night pearl, shining brightly all around. The beast's head has seven small beads on all sides, and it is also the size of a fist. Xiao Heng observed carefully and found that the seven orbs were actually arranged according to the Big Dipper Seven Star Array.

The Big Dipper Seven Star Array is composed of seven stars such as Tianshu, Tianxuan, and Tianji in Ziweiyuan, and the Seven Star Array has evolved from this. The solution of the Big Dipper Seven Star Array has long been lost, but one or two remnants have been left, and the solution that Mu Zongxin created to find this Seven Star Array is really powerful.

Xiao Heng is not proficient in the metaphysics of the formation, but he was sent to Guanglin Temple back then, and he followed Master Huiyun to understand one or two things, and he was afraid that it was a little tricky to solve this long-lost ancient formation.

But now I have to give it a try. If Tianshu is the head, down is Tianxuan, the seven stars are connected, and the left leads to Yuheng......

After a long attempt, the door finally clicked and opened.

Inside is a study-like place, luxurious and elegant, with tall shelves everywhere, and all kinds of books and treasures.

No longer being able to afford any more time, he quickly rummaged through it. The salt transportation book is one at a time, and it is estimated that a lot has been saved, so it will not be too difficult to find. Under the wooden shelf was a cabinet, and Xiao Heng had to work hard to find the books that were not on the shelf, so he rummaged through the cabinet.

The more time passes, the more time passes. Finally, when I opened a carved wooden cabinet, I saw a thick pile of documents, the first one of which said that the salt transport voucher was a big character, and the lower left was stamped, and it was written on October 12, the ninth year of Yuanxi.

In the ninth year of Yuanxi, that is, seven years ago, the Mu family actually did such a thing when the emperor reigned seven years ago, and it was still prosperous, and the Mu family was still active in the officialdom! Xiao Heng's heart sank, and he secretly raised his guard against the Mu family.

Salt transport is in hand with a book, and it will be much easier to do later. But Xiao Heng didn't plan to leave immediately, and Zhao Xianxian's matter might also be able to find some clues in this secret room. He observed the secret room for a week, and finally fixed his eyes on the desk next to him.

The case is estimated to be where Mu Zongxin works, and there is a circle of wooden cabinets around it, all of which are locked with heavy locks, which is estimated to be a storage place for more confidential things.

This salt transport book is also a big handle of the Mu family, but it is not placed in these wooden cabinets, what else is locked in this wooden cabinet?

Xiao Heng carefully observed the locks on the four wooden cabinets, which were extremely heavy in his hands, and it seemed that they were made of fine heavy iron, and it was impossible to forcibly break them. This lock is also unlocked with a key, and it can't be opened at all unless you get the key.

Xiao Heng had to give up. He hid the stack of papers in his bosom and, after making sure it was correct, prepared to leave.

At this time, the door "clicked" and opened.

Someone's coming.