When he returned home, Di Renjie was still thinking about how to solve this case. Even if the authentic exit was in Chang'an, Chang'an was so big that tens of thousands of residents were checking each other. When it was time to find out, it would almost be three feet away from the surrounding area of ​​Chang'an. There was no clue yet. Thinking of what Li Zhi said today, His Majesty came to the village and couldn't go back to Ganlu Hall for a while. It was for the Haimaster. When he thought about Haimaster, Di Renjie immediately sat up from the bed. Compass! The compass can break his Qimen Dunjia.

The next day, Di Renjie brought the people from Dali Temple to Tang Jian’s house with a compass early in the morning, and saw that Li Chunfeng was also here.

"Master Li, are you?" Di Renjie was puzzled.

"I haven't seen such a Qimen Dunjia technique for many years, so I'll come and take a look." Li Chunfeng looked at me and said, "Can I go down and take a look."

"Of course." Di Renjie nodded, took a compass, walked down the tunnel with a few Dali Temples. He used the torch light to confirm the direction and then drew a direction, then drew a point on the map of Chang'an. After confirming, he looked down at the compass and walked forward.

You will easily lose your direction in the dark tunnel, and you will not be able to find the direction after you have the compass in your hand.

Li Chunfeng was also in the authenticity, "What's this thing in your hand?"

"This is a compass." Di Renjie said with a smile, "a little thing made by the teacher."

Li Chunfeng was holding a gossip compass in his hand, "Just relying on this little thing in your hand, I want to break this Qimen Dunjia? The Qimen Dunjia technique is unfathomable, so I'll help you find the exit."

"Of course it's good to have Master Li's help." Di Renjie looked at the compass all the way, "but boy wants to give it a try."

"It's up to you." Li Chunfeng continued to walk with the compass.

Di Renjie walked very slowly, and as he walked along the way, the sense of direction given by the compass was different from the feeling of walking in the tunnel yesterday. There were many eyeliners outside Chang'an, and with the monk's staff, all the city gates were guarded everywhere. Tang Jian's family could not be able to leave the city under such circumstances.

The route on the map turned a corner, and Di Renjie looked happy. As expected, he was still in Chang'an City. The route followed the direction of the compass, then drew directions and came to the tunnel entrance that collapsed yesterday. It was drawn with a general range based on his feelings and distance. It was in a large courtyard in the west city and several houses.

After finding the approximate address, Di Renjie turned around and looked at Li Chunfeng, "Dao Master Li saw something?"

"It's really strange." Li Chunfeng was puzzled, "I have been here three times, why did I return to my original place?"

Di Renjie smiled and said, "Master Li is not very profound, but he just used our sight to deceive our sense of direction. Although Qimen Dunjia is mysterious, I still believe in the science that the teacher talks about more."

Li Chunfeng looked at Di Renjie, "Have you found the exit?"

"I almost found a range, and then it was convenient to find it. As the teacher told us last night, we were placed in a row. The tunnel was very long, so long that we thought the exit was outside Chang'an City, but there were no traces of fortifications outside Chang'an City, and there were no traces of Tang Jian's family. We suspected that they had not left Chang'an at all, and the guards of Chang'an City Gate could not get out of here."

Li Chunfeng looked at the direction and route drawn by Di Renjie, "Have you cracked it?"

"Yes!" Di Renjie nodded, "As long as you find a sense of direction, it is actually not difficult at all. The reason is very simple, it is a reference object. Without a reference object on the vast ocean, you will lose your direction. With a sense of direction, it is not difficult at all."

"You rely on such a small thing?" Li Chunfeng looked at the compass suppressedly, "Is this thing so mysterious? I have also been involved in the Qimen Dunjia, which is not as good as the small thing in your hand?"

"In fact, it's not that everyone has its own advantages. The usage is different, and the effects and results are also different." Di Renjie said: "The method of achieving the goal is different. Qimen Dunjia is mysterious, but many things are too obscure. Science is to explain complex things more reasonably and solve problems more directly and intuitively."

"I have seen these scientific knowledge in the academy over the years." Li Chunfeng agreed, "Science does make many things more straightforward and easier, but it always feels less of the original taste."

The two walked out of the tunnel, and Di Renjie gave the compass to Li Chunfeng. "The teacher made a lot of this thing, but he has been using it for sea trade. The little thing is not worth a lot of money, so he gave it to Master Li."

Li Chunfeng put away the compass. Even though this thing is small, Li Chunfeng still dared not underestimate it. He used the compass to not crack the Qimen Dunjia, but this small compass can solve the problem so simply.

The world has changed, Li Chunfeng sighed that Gu Qing's science has changed too much for students today, and the knowledge of the Tang Dynasty will change drastically in the future. Whether it is Qimen Dunjia or other knowledge, there will be changes and conflicts.

Di Renjie started to catch people with people, but he was very cautious and everyone was wearing a sword and was ready for battle.

Several spies replied, "Reported to the Dali Temple Minister, I have figured it out, and there are several families that are indeed suspicious."

The people were divided into four teams, and Di Renjie ordered: "Take action at the same time, don't be careless! Take down the person when you see him, don't be afraid of procrastination, hold each one and be one!"

"yes!"

On the streets of Xishi City, a spy in Dali Temple in black immediately took action and at the same time broke into the homes of residents. A lot of screams and surprises came.

One of the families even cried loudly.

"Dali Temple Minister, found it!"

Di Renjie nodded and walked over step by step. The destination was really at the end of a street in the West City. This was a courtyard. When Di Renjie came here, Tang Jian's family was there.

When I walked into the yard, I also found that the tunnel covered by the warehouse next to me had collapsed.

"The Dali Temple Minister, there are no other outsiders here except Tang Jian's family." The minor official of Dali Temple replied: "I really didn't expect that they were in the city and we were all deceived."

"Just find it." Di Renjie comforted them, "Take all the people here to Dali Temple for interrogation, check the place carefully, and don't miss any clues. Be sure to catch the mastermind who helped Tang Jian's family leave."

"yes!"
Chapter completed!