In early March, Zhao Tuozhi and his party of 800 men all left Liangzhou, and soon after going to Fanyang, the Tang army began to gather in Liangzhou and Lanzhou, and in less than half a month, they gathered more than 20,000 troops in each of them. Xu Qing thought that he took Sun Jieyu and Princess Jinchi from the Lanzhou Palace by the Tang Dynasty intelligence officers, Li Zhi and Wu Zetian were furious and sent a large army to encircle and suppress the mighty dart bureau, Xu Qing felt that when he did that, his whereabouts were secret, and he was sure that he was not followed, but the matter was revealed, which showed that the mighty dart bureau had a spy mixed in by the imperial court.

The Weiwu Dart Bureau has recruited nearly 10,000 employees in about half a year, and it is very easy for the imperial court to install spies into the Weiwu Dart Bureau. The remnants of the Sui Dynasty led by Yang Ziyan and her late father struggled against the Tang Dynasty for decades, and the intelligence and spy personnel of the Tang Dynasty court had long been eyeing the original Heifengling bandit group, and maybe there were Tang Dynasty spies who infiltrated the original Heifengling bandit group ten or twenty years ago.

There is also a possibility, that is, the Anxi Protectorate and the four towns of Anxi fell into the hands of Tubo, which is equivalent to losing a large area of land in the Western Regions that countless Tang Dynasty soldiers have exchanged for blood for decades, and the Tang Dynasty has since ceased to be the upper kingdom of the Celestial Empire, and can no longer become the co-lord of the world.

Xu Qing was born in the army and did not take chances about the war, preferring to believe that the Tang army's concentration in Liangzhou and Lanzhou was aimed at the remnants of the Sui Dynasty rather than against Tibet. To this end, Xu Qing began to make the following preparations, the first is to find out the traitors who are mixed in the mighty dart game; The second is to step up the manufacture of pistols and the imitation of submachine guns, and strive to equip the army with as many new weapons as possible; The third is to build fortifications, so that there is no need to worry about the mighty dart bureau looking like a strong castle, which makes the court suspicious, and at the same time a large number of cold weapons such as bows, arrows, crossbows, logs, rolling stones and other materials for defense and warfare; Fourth, the excavation of tunnels leading from four directions to ten miles away, which can be used as a secret passage for launching a surprise attack in wartime, and in case it cannot be defended, it can also retreat from the secret passage; Fifth, strengthen the military and martial arts training of the caravan, and no longer worry that the armed forces of the caravan will attract the attention of the imperial court.

At this time, it was the time when all the plants and trees were soldiers, and in view of the fierce factional struggle among the remnants of the Sui Dynasty, Xu Qing did not trust anyone except for Yang Ziyan and a few other women who had a close relationship with Xu Qing. Even if it is Xu Qing's woman, at this time, Xu Qing only completely trusts Yang Ziyan alone, and she doesn't dare to fully believe Li Xiu'er, Cui Ling, Yang Min, Yang Siqi, Fei'er, and Lian'er, because Li Xiu'er is the lord of the Western Turkic county and the envoy of the pro-Tang Dynasty, Cui Ling's brother is Xu Qing's rival in love, her father remains neutral in the power struggle between Yang Ziyan and Yang Cheng, and is not a supporter of Yang Ziyan, Yang Min's brother and Yang Siqi's father are the same person, Yang Yi, who supports Yang Cheng and opposes Yang Ziyan in the power struggle between Yang Ziyan and Yang Cheng, and once contacted Cui Meng, trying to launch a military coup d'état to overthrow Xu Qing and Yang Ziyan, Fei'er and Lian'er were both members of the imperial court, and Lian'er was still a princess of the Tang Dynasty, and the possibility that they didn't want to mix with the Sui Dynasty thieves could not be completely ruled out. There are 8,000 people in the mighty dart bureau, plus 5,000 people transferred to the horse gang, a total of 13,000 people, Xu Qingneng can really trust only Yang Ziyan alone, to investigate 13,000 people, and find out the traitors, and the spies are only a few, the vast majority of people are their own people, and they can't be tortured, which has become an extremely heavy and almost impossible job.

However, Xu Qing is from the future and has advanced interrogation methods, and he uses a homemade artificial polygraph to interrogate suspects.

The basic principle of a polygraph is that when a suspect hears a question that is relevant and unrelated to the facts of his crime, his blood pressure and pulse will be different. Yang Ziyan is a master of martial arts, with profound internal skills, and martial arts practitioners must learn a certain amount of knowledge about the treatment of external injuries, internal injuries, and poisoning, and their ability to detect small changes in the pulse is no less than that of Chinese medicine with excellent medical skills. Xu Qing taught Yang Ziyan the method of polygraphy, and then asked Yang Ziyan to interrogate Li Xiu'er, Fei'er, Lian'er, Cui Ling, Yang Min, Yang Siqi, Ling'er, Mei'er, Ye'er, Hong'er, Zhao Mengchen, Zhao Chunhua, Mrs. Zhao, Mrs. Zhao Tuocai, Yang Yi, Cui Zhenhai, Luo Huiliang, Yang Xiongcai, Yu Junsheng, Wang Shouxin, Zhao Zengyi, Zhao Tuocai, Nie Hu, Nie Qing, Cui Meng, Yang Chao, Luo Zhi, these core members of the "Shuguang Group".

Yang Ziyan took the pulse, Xu Qing asked, and asked, "What's your name?" "Is this your real name?" "Where is your home?" "Who's in the house?" "When will you join the Black Mountain Ridge Cottage/Mighty Dart Bureau?" "Why did you join the Black Wind Ridge Cottage/Mighty Dart Bureau?" "Are you a court spy?" "Are you the emperor's man?" "You're not a queen?" "You're not an emperor?" "Are you a member of the Empress Martial Arts?" "Do you know that betraying me is the only way to die?" "Are you an undercover agent of the imperial court?" "How long have you been undercover?" "Who's the one you're talking to?" "Who's your boss?" "Do you have a good relationship with the leader?" "What's your leader's name?" "How old is your leader?" "Is your direct supervisor male or female?" "Is he/she handsome/pretty?" "How many of the most important people are you in your life? What is your name? How old is it? "How many pieces of information did you pass on to the imperial court?" "Have you ever provided information to the Imperial Court?" "Have you ever been trained as a spy?" "What's the code for your joint?" "How often does your codeword change?" "How long have you been lurking here?" These questions ask keywords such as "spy", "spy", "traitor", "undercover", "queen", "martial queen", "emperor", "emperor", "imperial court", "joint", "code", "code", "secret", "latent", "news", "intelligence", if the person being tested is a spy of the imperial court, there must be these keywords in the brain, when asked, the brain will react, and trigger a series of associative reactions, such as remembering the instructor, boss, colleague in his spy career, Connector people, connector codes, etc., are out of control, and emotional fluctuations will inevitably cause pulse fluctuations.

After nearly a day of testing, the results came out, Mei'er, who was born and raised in Heifengling, followed Yang Ziyan for eight years, is now nineteen years old, and is regarded as one of the four captains of Yang Ziyan's personal maid and female guard who is regarded as a confidant and given a name, is a spy placed by the imperial court next to Yang Ziyan. Mei'er's parents are both court spies, 20 years ago into the original Heifengling bandit group, Mei'er's father is named Xiao Shanshu, originally in the Heifengling bandit group as a military doctor, now in the mighty dart bureau as a doctor, Mei'er's mother is named Li Hehua, and Xiao Shanshu joined the original Heifengling group, is also a doctor, and a midwife. Mei'er was born in Heifengling Cottage and grew up in Heifengling Cottage, Yang Ziyan treated her very well and was like a sister, but her parents trained her to be a court spy since she was a child, and she did not have the right to choose her origin.

Wang Shouxin is not a spy of the imperial court, but he has always been a supporter of Yang Cheng, and he was dissatisfied with the "Jin Manlou" killer organization that he was transferred to Liangzhou after being transferred to Liangzhou, and the "Jin Manlou" killer organization created by Xu Qing was divided into two, and he was dissatisfied, and he planned to take advantage of the Tang Army's encirclement and suppression of the mighty dart bureau to escape from Liangzhou, return to Fanyang, and win over his "Jin Manlou" henchmen, break away from the Yang family, and set up his own door, the money he earned before was used to develop the Yang family's power, and in the future he wanted to spend the money he earned himself, enjoy life, and don't care about politics.

Xu Qing is an astrologer, a god-like existence in the mighty dart bureau, a simple artificial polygraph found out the secret that Mei'er has hidden in her heart for many years, and she had to confess in front of the advanced polygraph technology that the "astrologer" Xu Qing had never heard of in the world, but hoped that Yang Ziyan would give her a good time for the sake of her serving her for many years. Yang Ziyan was very angry and disappointed with Mei'er, and asked Mei'er's parents to be interrogated. Mei'er was recruited, Mei'er's parents knew that their identities were exposed, and they had to confess, and even the polygraph and torture were saved.

Xu Qing saw that Mei'er was a gentle and sweet-looking, charming and lovely beauty, although she was not as captivating as Fei'er and Qinglian, but she was also a beauty in a thousand, and she was secretly taught a lot of espionage knowledge by her parents who were professional spies. Xu Qing always wanted to set up an intelligence and espionage department, but he gave up because he couldn't find talents in this area. Therefore, Xu Qing said to Yang Ziyan: "I want to be a prison officer." ”

Yang Ziyan said: "Okay, it's just such a delicate beauty, you can't bear to see her beheaded?" Do you want to save her? Seeing that Xu Qing didn't answer, Yang Ziyan firmly believed in her own opinion, and said: "I don't agree to this, I will never tolerate those who betray me." ”

Xu Qing said calmly: "Can you trust me?" ”

Yang Ziyan said affirmatively: "Of course I can trust you!" You are my man, you are my God, I don't believe who do you believe? ”

Xu Qing said: "Just believe me, you will hand over Mei'er's family to me to dispose of, I promise that it will only be good for you, and there will be no harm." ”

Yang Ziyan said: "Okay, I'll hand over Mei'er's family to you to dispose of." ”

Xu Qing instructed his subordinates: "Bring Mei'er's family back to my office, and I will interrogate their entire family to see how many secrets they have about us." ”

Mei'er picked up a life from the brink of death, and the mysterious "astrologer" Xu Qing saved her, but maybe he would torture her in every way to find out the secret from her, so Mei'er was not happy at all. Mei'er knew that there would be this day since the first day she was an undercover agent in the court by Yang Ziyan's side, and she had said to herself thousands of times, "I'm ready, I'm not afraid of death", but when she really faced death, she was still pale with fright and her legs were weak. After all, she has lived peacefully by Yang Ziyan's side for eight years, and it is the first time she has faced death, after all, she is still only a nineteen-year-old girl, and the road ahead is still very long, and she has not seen enough of the beautiful world, she does not want to die. But when she had forgotten the threat of death, death came unexpectedly.

Mei'er and her family were escorted by Xu Qing's personal soldiers to the office of the head of the mighty dart bureau, Mei'er's mind was almost blank along the way, if she confessed to the same party, she and her parents endured humiliation, and it was in vain to be an undercover agent in the remnants of the Sui Dynasty, she and her parents would be regarded as traitors by the court, if they were not recruited, she and her parents would be executed, she was only nineteen years old, she had not lived enough, she really didn't want to die.

Xu Qing interrogated Mei'er in his office. Yang Ziyan listened, and Ling'er, Yang Min, Yang Siqi, and Cui Ling made notes.

Xu Qing interrogated the three members of Mei'er's family separately and asked them the following questions, "How old are you?" "What's your real name?" "Where's home?" "Who's in the house?" "Is your organization called Xuandaomen? "When did you join the Xuandaomen?" "Who arranged for you to be an undercover agent?" "Who's your boss?" "Who is the person who is connecting with you?" "Where are the joints?" "How did you get the information?" "How did you get the information out?" "What's the code for your joint?" "Is the person you are connecting with a man or a woman?" "Is it tall or short?" "Is it fat or thin? "What does it look like?" "How old?" "How many pieces of information have you sent out, what is it?" "Are there any of your comrades here?" "How is Yang Ziyan treating you? Is it good or bad? "Aren't you afraid of death? ", "You are so pitiful, you have lived for so long, your feelings are still blank, have you found a man who loves you? (This sentence only asks Mei'er, who has not yet married), "Do you have a man you like?" (This sentence only asks Mei'er, who has not yet married), "What did the court give you?" I can give you what the court can give you, you say how much money the court will give you, promise you how big an official, I can give you double the money, a bigger official. ”

Mei'er only answered the first question, "Nineteen years old", and did not answer any of the other questions. Xu Qing had long expected this result, so she was not in a hurry, and asked her soldiers to lock her in a small room, close all the doors and windows, tie her hands and feet with ropes, and prevent her from leaving the small black room for half a step except for urinating and urinating. She was not given food, but only water. First lock her up in a black cell for two days and then see if she can recruit her. Mei'er's parents also did not confess to their accomplices, and they were also kept in solitary confines in black cells.

Wang Shouxin is not a beauty, he doesn't have such a good life, Xu Qing personally supervised, secretly executed Wang Shouxin in the middle of the night who had the heart to escape and stand on his own, and then sent his henchmen to Fanyang overnight to deliver a letter, so that Zhao Tuozhi and Jia Quan executed Wang Shouxin's family and henchmen with lightning speed.

The next day, Xu Qing taught the advanced polygraph methods of later generations to more than 20 masters in the core layer of polygraphy, and measured the progress of about 600 people in one day, and spent nearly 20 days to take polygraphs on the 8,000 people of the Mighty Dart Bureau and the 5,000 people hidden in the horse gang of the Mighty Dart Bureau, and found out three court spies, two men and one woman, they are all Sun Jieyu and Princess Jinchi were taken away from the Lanzhou Palace and mixed into the Mighty Dart Bureau, they are all newcomers, the highest position is only the platoon commander, no one has mixed into the new army, but Mei'er is the company commander in the new army, I am afraid that the news of the new army and new weapons has leaked out.

By the time Xu Qing finished his lie, a total of about 50,000 elite soldiers of the Tang Dynasty gathered in Liangzhou and Lanzhou had all left and headed for the battlefield in the Western Regions. Xu Qing successfully cracked the spy group planted by the imperial court in the mighty dart bureau by mistake, and detected Wang Shouxin's rebellious heart, and executed Wang Shouxin in time, which was really lucky.