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As for the motive, it was naturally for the throne. Both the Second and Third Princes were competitors for the throne; eliminating either one would be profitable.

“Coroner, can anyone in Mobei Kingdom easily obtain black grass?”

The coroner nodded, “Yes, but to make black grass effective, it still requires a doctor.”

Chu Qingzhi had a hypothesis. She took the silver needle Chu Xujin had given her earlier, held both ends, and pulled, stretching the needle into a thin silver wire.

Everyone was astonished.

Chu Qingzhi inserted the silver wire into the hole in the corpse’s finger until it could go no further.

The tip of the wire stopped at the wrist.

Her hypothesis was preliminarily confirmed. Chu Qingzhi said to Chu Xujin, “Third brother, go find Hongjun and ask him for a hollow silver needle.”

“Alright.” Chu Xujin immediately went to find Yuan Hongjun, wondering if a silver needle could indeed be hollow.

Yuan Hongjun followed Chu Xujin back to the Ministry of Foreign Affairs and handed a hollow silver needle to Chu Qingzhi, “Master.”

Chu Qingzhi used the same method to stretch the hollow needle into a thin wire and then inserted it into the wine bottle. The wine from the bottle quickly flowed out through the other end of the wire.

This spectacle left everyone dumbfounded, staring at Chu Qingzhi’s hands in disbelief.

“Do you all understand now?”

Everyone came back to their senses and shook their heads. They understood the action but not the meaning.

Chu Qingzhi explained, “Someone used a silver wire like mine to inject purified black grass juice into the Third Prince’s body, causing his heart to stop suddenly, leading to his death.”

“Then, under the anesthetic, the body’s reactions are slow, making the body think it’s still alive, which is why at first glance, the Third Prince’s corpse looked like he was asleep.”

The coroner said, “But inserting a silver wire into the body would be painful, yet the maid who was guarding outside didn’t hear any cries of pain.”

Chu Qingzhi said, “The Third Prince drank wine that contained the black grass. The wine can double the anesthetic effect of the black grass and circulate the blood throughout his body, inadvertently giving himself a full-body anesthesia. At that time, when something pierced his body, he had no sensation. When the black grass was injected, he lost all sensation.”

“Full-body anesthesia means the entire body is in a state of no sensation, almost unable to feel pain.”

Chu Qingzhi summarized, “Based on what I’ve said, 1 deduce that the murderer is from Mobei Kingdom. This person is highly skilled in medicine and martial arts, especially in lightness skills. Third brother, Officer Ren, you can start arresting people now.”

The rest didn’t need to be said by Chu Qingzhi. Ren Buqing had already understood.

“Follow me!” Ren Buqing and his men immediately sprang into action.

Yuan Hongjun was somewhat confused, “Master, why does the murderer make the murder so complicated?”

Chu Qingzhi glanced back at Bei Chunlu, “Because the murderer is taunting us.”

Yuan Hongjun pondered, “Master, you mean that the murderer is very confident in their medical skills and used this method of killing, sure that we wouldn’t find out the cause of the Third Prince’s death?”

Chu Qingzhi nodded, “Otherwise, just for murder, a single stab would have sufficed. Why go through all this? Moreover, if the Third Prince had died inexplicably in the Daling Dynasty, the Daling Dynasty would have had to give an explanation to Mobei Kingdom.” A hefty compensation would undoubtedly be inevitable.

Yuan Hongjun asked, “Master, what do we do next?”

“I’ll tell you in a while.” Chu Qingzhi turned to Chu Qingning, “Fourth sister, the next operation might be dangerous, so I’ll send you home first.”

“Okay.”

Chu Qingzhi and Yuan Hongjun together escorted Chu Qingning home, then returned to the streets. “Let’s go to the inn closest to the Ministry of Foreign Affairs. He… is likely there!”

Based on the criminal’s psychology, he would definitely be observing the situation’s development from somewhere close to the Ministry of Foreign Affairs yet inconspicuous.

The nearest inn to the Ministry of Foreign Affairs was the “Youjian Inn,” a very famous place that was almost always fully booked.

Chu Qingzhi and Yuan Hongjun came to the entrance of the inn. Two red lanterns hung on the eaves, emitting a bright light in the night.

When the waiter saw the two of them, he hurriedly came out to welcome them. “Please come in.”

Chu Qingzhi was the first to enter the inn. To their observation, the inn seemed normal, as Ren Buqing and his team hadn’t searched here yet.

Yuan Hongjun observed his surroundings and followed behind Chu Qingzhi.

Approaching the counter, Chu Qingzhi gestured to the innkeeper. “Innkeeper, are there people from Mobei Kingdom staying here?”

The innkeeper replied, “Yes, they’re on the third floor, third room on the left.”

“Thank you.” Chu Qingzhi signaled Yuan Hongjun, and they headed upstairs.

Yuan Hongjun asked in doubt, “Master, could it really be him?”

Chu Qingzhi confidently said, “We’ll see.”

Yuan Hongjun wondered, “But we’ve never seen the murderer. How can we be sure it’s him?”

Chu Qingzhi replied, “Hongjun, a doctor skilled in medicine often interacts with medicinal herbs and always carries a scent of medicine…”

Realization dawned on Yuan Hongjun, “I understand, Master.”

They reached the third room. Yuan Hongjun knocked lightly, “Guest, the inn is offering free fruit. If you want it, please tell me in person.”

The door opened swiftly, revealing a young man with a cold demeanor. Seeing it wasn’t a waiter, he frowned suspiciously and attempted to close the door.

In that brief moment, the air from the room carried a faint scent of medicine.

Yuan Hongjun swung his sleeve, releasing a peculiar fragrance that caused the young man to faint instantly.

His knockout drug could instantly render a bull unconscious, so incapacitating a man was effortless.

Hearing the commotion, another young man inside approached them, but before he could speak, Yuan Hongjun rendered him unconscious in the same manner.

There was no more movement in the room.

Yuan Hongjun pushed the door open and slowly walked into the room with a guarded look in his eyes.

However, the room was empty.

Chu Qingzhi curled her lips and took out a bell. She shook it, and invisible waves of spiritual light spread out.

A moment later, the sound of something heavy falling to the ground could be heard.

Yuan Hongjun turned around and looked at Chu Qingzhi. His master was after all his master. She could knock people down without any effort.

Chu Qingzhi walked in.

Inside the room were three people: two young men by the door and a man in dark robes in the center, right under the beam. The bedsheet was flipped, and a pair of shoes was in front of the bed…

Yuan Hongjun looked up at the beam. The suspect had hidden in such haste that he didn’t even have time to put on his shoes. “Master, shall we take him to the Ministry of Justice?

“Not so fast. Catching someone requires evidence. The hollow fine needle is not easy to make, and he likely wouldn’t discard it. We need to find the item to confirm his guilt.”

“Understood, Master..” Yuan Hongjun rummaged through the room