"Princess, we indeed didn't hear any noise that night." Xia Yu was extremely annoyed.

He was on duty that night, so the iron box was lost from his hands.

He had thought about it for a long time these past few days. Are their abilities so poor?

They are not warriors trained just for killing, but capable assistants of their masters who need to learn everything.

“The first time, he disappeared without a sound.

This time is the same, so the enemy must have used the same method.

We just need to figure out what method they used to get it and we’ll know how they stole it.”

Yu Yuzheng connected the two times and made an analysis.

"Princess, could it be that they dropped from the sky?" Zhuiyun was also very angry.

"How could it fall from the sky? Everyone could see it. Even if it was dark, we could still detect it." Zhuyue denied him.

"I'm just talking." Zhuiyun gave him a sidelong glance.

“There were 10 of us, with people going in every direction.

If they sneak into the palace directly and quietly approach Linheyuan, we will definitely be able to detect it.

Moreover, even the garden in the palace has people arranged every night." Chun Lei analyzed.

Now the guards of the entire palace are more difficult to enter than before.

In fact, the weakest point is the main gate, which has only a few gatekeepers.

But no one would choose to come in through the front door.

"If they didn't fall from the sky, nor did they sneak in directly, then it could only be done by one of our own people, who hid in Linheyuan in advance." Xia Yu thought of this possibility.

"No one in Linheyuan has ever gone out." Yu Zheng was sure of this.

Besides the secret guards, there were only weak women and a few children.

Unless someone is a master of hiding, no one will find out.

Thinking of this possibility, Yu Zheng's heart skipped a beat and he broke out in a cold sweat.

It couldn't be that the woman in her courtyard was a martial arts expert. She was a spy arranged by the enemy and had been hiding.

"Chun Lei, what's the difference between people who practice martial arts and ordinary people?" Yu Yu Zheng really didn't know.

The most she could see was that people who practiced martial arts looked stronger and more robust.

"Replying to the Crown Princess, people who practice martial arts have a slower heartbeat." Chun Lei pointed out the biggest characteristic.

The martial arts can be hidden, the lower body can be hidden when walking, but the heartbeat is something that a martial artist cannot control.

"Madam Ye, gather everyone in the courtyard together." Upon hearing this, Yu Yuzheng immediately stopped Madam Ye who happened to be passing by outside.

At that moment she realized that athletes' heartbeats are slower than those of ordinary people.

Nanny Ye didn't ask why, and she called all the servants who served in the entire courtyard to the main hall.

Yu Zheng pressed their pulse points one by one.

It turned out that they were all ordinary people, with heart rates ranging from 70 to 80.

This possibility was ruled out, and Yu Zheng felt relieved.

Several people were trapped in a dead end again.

“If it’s neither in the sky nor on the ground, then the only option left is underground.” Yu Zheng thought of another possibility.

When she said this, several guards seemed a little unconvinced.

"Princess, it's not easy to dig a tunnel, especially in a mansion like Prince Xu's, not in a remote outer city.

If we want people to not notice, how many years will it take to dig? Decades? And how to deal with the soil?" Chunlei analyzed from a practical point of view.

"It's hard to say. Since we think it's possible, let's check in this direction." Yu Yuzheng thought of the tunnel warfare she had seen in her previous life.

Although the tunnel was not dug secretly and involved the participation of the entire nation, it still took six years.

But if Canglan Country was determined to steal the iron box, it would take decades. The palace had not moved.

The more I think about it, the more possible it seems.

"Chun Lei, organize people to pry up the floor tiles. Let's start with the main hall." Yu Yu Zheng said without hesitation.

She wanted to make sure whether her idea was wrong.

The floor tiles of the palace are not bricks, but stone slabs. It is quite a task to pry the tiles apart.

"Yes, Crown Princess." Chunlei immediately took the order and went to the housekeeper to ask for some servants.

"Xia Yu, the rest of you, knock on each floor tile first and listen to the sound to see if there are any empty ones."

Yu Yuzheng had an inexplicable premonition that this might be what she was thinking.

The groundbreaking ceremony was about to begin. Yu Yuzheng was moving to another new yard.

Now that her father and concubine were no longer in the palace, she simply moved directly to the main courtyard. She no longer lived in the main house, but in the right wing, where Shangguan Ziqi had lived before he was seven years old, and where her younger sister would live from now on.

Anyway, Qiyayuan will be repaired in a few days.

It is also convenient to take care of household expenses when living here.

Yu Yuzheng brought a group of maids and servants to the front, followed by Xia Yu and the other two, who immediately took thicker wooden sticks and started knocking on them one by one.

As a result, I knocked on all the stone slabs carefully and found nothing unusual.

The chief steward sent ten servants to move the princess's belongings to the main courtyard first.

Then move all the furniture into the yard.

Then, according to the Crown Princess's instructions, the stone slabs were pried up one by one.

Let’s start from the main hall.

The stone slab was not easy to pry open, and it took a lot of effort.

When they pried at the north main seat, they found the problem.

The four stone slabs were unexpectedly different from the others.

It seems to be embedded in something and cannot be pried out at once.

Especially strong.

As soon as Yu Yuzheng got the news, she went to see them.

As the four stone slabs were destroyed, what was underneath was revealed.

It is an iron frame with four stone slabs embedded in it.

It is also movable and can be raised and lowered.

This is a mechanism.

The iron frame was buried in the soil.

Looking at the soil again, it was soft and you could tell it was only filled in not long ago. No wonder there was no hollow sound when they knocked on it.

"Clear out all the dirt." When Yu Zheng saw the situation, there was nothing unclear.

The thieves came in from underground.

But this was too much of a coincidence, the iron box was on the table right above the stone slabs, and the thief only had to lean out half of his body to get it. If she put it somewhere else, the thief would have to climb up from below to get it.

The two servants continued to clear out the loose soil.

There was a huge pile of them in the yard. It was obvious that the other party had made preparations long ago, and sealed the hole as soon as they got the box.

After the cleanup, an underground tunnel appeared in front of everyone.

"Oh my God, these damn thieves." The butler was heartbroken.

He has been in the palace for fifty years and grew up in it since childhood, so how come he didn't notice anything?

Someone actually dug a tunnel under the palace.

"Chun Lei, light the lantern. I want to go down and take a look myself."

"Princess Consort, you'd better not go down. What if there is danger?" Chun Lei disapproved.

What if there is a trap or an enemy hiding below?

They were also derelict in their duty by failing to protect their master.

"You go in the front and I'll go in the middle." Yu Yuzheng insisted.

"Princess, I'll go down too." The chief butler also wanted to go and see, and he wanted to report the truth to the prince.

He wanted to see how these thieves did it.

"Okay, let's go down together." Yu Yuzheng knew how miserable he was when she saw his hateful look.

The palace was bullied by the Canglan Kingdom to this extent. As a member of the palace, who wouldn't be angry?

Each person held a lantern and went down through the cave entrance.

The space below is not wide and can only accommodate one person.

Just after walking about ten feet, I found a fork in the road.