The time came to the next day, and before Li Chengfeng and the others started their investigation, Qi Yu from Yunzhou Prefecture came to them.

"Eighth prince, it's not good, officers and soldiers of the city defense army were attacked again yesterday!" Qi Yu said anxiously.

Li Chengfeng was making tea in the room at this time, when he heard Qi Yu's words, he quickly put down the teacup in his hand.

"Take me there to see where the crime happened!" Li Chengfeng said in a calm voice.

Soon, Li Chengfeng rushed to the south of the city with a group of people led by Qi Yu.

After Qi Yu's introduction on the road, he finally learned the real situation of the attacker this time.

It turned out that the person who was attacked this time was a school lieutenant of the City Defense Army, who was in charge of the defense of the south gate of Yunzhou City.

The people who were assassinated before were all civilian officials. I didn't expect that the White Lotus Sect would attack the city defense army this time.

And this assassination was really weird, the captain died in his room.

The other soldiers guarding the door did not find any suspicious traces.

The killer seemed to appear in the captain's room out of thin air, and then disappeared out of thin air after killing someone.

Qi Yu has already understood that there is no secret room in the whole room where the crime happened. Could it be that the other party is a fairy?

After listening to the whole incident, Li Chengfeng already had some guesses in his heart, so he couldn't help speeding up his steps.

A quarter of an hour later, a group of people drove down the mansion where the crime happened.

In the backyard of the mansion, there is a dry well and a group of guards stand guard at the door of the room.

The servants of the mansion had already been dispersed to the front yard, and there were no idlers in the back yard.

Li Chengfeng and Qi Yu walked into the room.

There was a burnt incense burner on a low table in the room, and the corpse fell in front of the small table, dying.

There are still residues of Fanxiang in the room, which shows that the room was previously in a relatively closed space.

But where did the killer come from? Li Chengfeng was very confused.

Seeing him frowning and thinking, Qi Yu who was at the side spoke up and put forward his opinion.

"Eighth Prince, I have some opinions here, I wonder if I can help you!" Qi Yu said with a slight salute.

First of all, Qi Yu carefully inspected the wounds of the corpse. Judging from the wounds, it should have been pierced through the back of the heart with a simple knife and died.

To achieve such a wound, either the deceased trusted the murderer very much, or he was killed by a surprise attack.

Otherwise, it is impossible for a school lieutenant of the city defense army to have no resistance.

There is no secret room in the room, so it is very likely that this can be hidden in the room early in the morning.

While waiting for the captain to return, he was killed with one blow.

"It's just that the villain can't figure out how the killer ran away in full view!" Qi Yu said with a long sigh.

Many officials have been assassinated these days, and the Turks are attacking the Great Wall, so he is also very anxious.

But Li Chengfeng didn't pay attention to Qi Yu's words. At this time, he was lying on the ground looking at some broken mud under the low table as if he had discovered a treasure.

This mud is different from the yellow mud on the road, it is black, and only a small handful is near the corpse.

"Eighth Prince? You are?" Qi Yu was a little confused.

Li Chengfeng said nothing, stood up and moved the corpse aside, waved his hand to let the Seven Killers outside the door come in.

"Move the corpse and the table away, and pry open the ground under the table, there must be something wrong here!" Li Chengfeng said.

After speaking, he walked to Qi Yu's side, and saw that Qi Yu's face was full of doubts.

"Eighth Prince, I've checked everything below, and they're all solid. It's impossible for an assassin to come out of the ground!" Qi Yu scratched his head and said.

Li Chengfeng took out the fan at his waist and fanned it slightly, explaining the whole thing.

It turned out that when Qi Yu saw his opinion just now, he accidentally saw the black mud on the corner of the table.

In an instant, he understood why the assassin was silent under layers of guards, and there were no clues about the repeated assassinations in the city.

Just because Bai Lian taught them to control a secret tunnel, the killer came out of the secret tunnel and hid it, and retreated leisurely after killing the person.

This kind of black mud can only appear in the cold and damp underground, which also supports what Li Chengfeng thought.

After listening to his explanation, Xu Yu, who was on the side, finally realized that if it was authentic, he was going in the wrong direction to check the secret room.

Moreover, this kind of tunnel that can accommodate one person is also difficult to be checked out.

"This subordinate has neglected his duty! Please punish the Eighth Prince!" Xu Yu knelt on one knee and said.

In any case, as the first person to come to the scene of the crime, it would be a dereliction of duty for him not to notice this.

Li Chengfeng stretched out his hands, supported him and said, "It's not your fault, if I didn't find those mud, even I wouldn't have thought of it."

At this moment, a member of the Seven Killers who was searching came over.

"Eighth prince, we found that there is something wrong with the bluestone slab under the wooden planks in the room! Shall we just dig it out?" the man said.

Li Chengfeng nodded, and walked out of the room with Xu Yu, while the Seven Killers stayed in the room to continue digging.

After a quarter of an hour, people from the Seven Killing Army came to report again, and they found a tunnel under the room as Li Chengfeng expected.

A smile appeared on Li Chengfeng's face, he finally caught the tail of the White Lotus Sect, and the next step was to follow the vine.

He followed the Seven Killers back to the room, and at this time the wooden floor of the room had been dug up a small piece.

A large bluestone slab under the wooden floor was removed, revealing a dark tunnel under the bluestone slab.

Several of the Seven Killers had entered the secret passage under the bluestone slab ahead of time to guard, and the flames were flickering under the bluestone slab.

Without the slightest hesitation, Li Chengfeng jumped into the secret passage.

Landing slowly, Li Chengfeng was able to see the whole picture of the tunnel.

Except for some deposited silt at the entrance here, the entire tunnel is wide and simple, like an underground palace.

According to his estimation, at least five or six hundred people could be hidden in this tunnel, not to mention that there are other passages in the tunnel.

After Li Chengfeng entered the tunnel, Xu Yu also followed in. Seeing the tunnel, he seemed to be thinking, and he lowered his head and pondered~www.mtlnovel.com~ Seeing his appearance, Li Chengfeng knew that Xu Yu might have discovered it. what.

"Master Xu, what did you discover?" He asked sideways.

Xu Yu nodded heavily and said: "I remembered, this tunnel was used by the previous dynasty to discharge floods, and it was also used to hide soldiers."

"I have lived in this Yunzhou City since I was a child, but this tunnel has not been used for a long time, and I have forgotten it."

"I just saw the bluestone slabs at the bottom of the tunnel before I remembered it. My father mentioned this to me when I was a child! There is no other place in the whole city that uses stone slabs of this size!"

Hearing this sentence, the smile on Li Chengfeng's face became brighter.

"Since this is the case, we will divide into two groups, and I will investigate the secret passage here. I will leave a mark and wait for you to come over"

"You go back and immediately search for people to investigate the blueprint of this secret passage. I don't believe that no one knows!" Li Chengfeng said, shaking the paper fan lightly.