Inside the office.

Li Xianglan explained: "My sister is Li Xiangqin. She works in a factory in this city. She called me when she got off work last Friday. After the phone was over, she has not returned home until now. But I can receive messages from her mobile phone every day. It is precisely because these messages are within 24 hours that the police station cannot file a case! But... but I am sure that it is definitely not her who sent the text message! Someone must have taken her mobile phone!"

Li Xianglan opened her phone and indeed showed two text messages she had recently sent to her, and these two messages were also sent yesterday and the day before yesterday.

——Sister, I want to go out for a few days, don’t worry.

——Sister, I won’t go back for now.

Li Xianglan said: "This person in the text message will never be Qinqin. I know her. She never calls me 'sister', she always calls me 'old woman'! And I had already made an appointment with her to go home for her birthday on the weekend, so something must have happened to her!"

Hearing these words, Murong Shui blurted out without thinking: "Sister Xianglan, why are you so honest? When you go to report the case, you shouldn't tell the police about sending text messages! As long as you don't say it, no one knows it. They don't know, so they have to investigate. Even if this matter is really found out in the future, you just insist that something goes wrong with your phone."

"Don't mess around! The matter has come to this point, what's the use of saying this?" Xu Tiannan signaled Murong Shui not to interrupt, and asked, "Is there anything wrong with the phone call you and your sister made when they got off work on Friday?"

Li Xianglan said: "There is nothing abnormal. She had just gotten off work from the factory and told me that I was going to go home with that friend named Gu Xiaobai. Because these two people usually have a good time, I didn't care at that time, but since then she has never answered the phone number again."

Murong Shui asked again: "Then have you ever found that girl named Gu Xiaobai?"

Li Xianglan nodded with a painful expression on her face and said, "I have found it, but the girl Gu Xiaobai is unwilling to say anything, and even refuses to admit that she went home with Qinqin that day. No matter how I asked her back and forth, she simply disappeared from me. I... I really don't know what to do, and I can't do anything to her..."

Murong Shui thought for a while and said, "Actually, adolescent girls are more delicate in mind. Is there a possibility that your sister is not actually missing, she is just with a boy with a good relationship..."

"No! Impossible! Qinqin is still young, so it is impossible to do such a thing!" Li Xianglan picked up the call record sheet and explained: "And look at this call record sheet. She has no call record for three days. That's because her phone has been turned off. The person who got her phone will only turn on the phone when she needs to send me a text message. Once she sends the text message, she will turn off the phone immediately. There must be a problem with this!"

Xu Tiannan, who had been listening to each other, finally asked: "If you follow the rules of receiving a text message within 24 hours, you will receive a message sent by your sister's mobile phone a few hours later. But if it is really as you guessed, the person who sent the text message was not your sister, then I think the other party is obviously delaying the time, and the purpose is to prevent this case from being filed."

Murong Shui asked: "Why did the other party delay time?"

Xu Tiannan whispered: "The missing person cannot be hidden. Since the other party intends to delay time, it is very likely..."

Having said that, Xu Tiannan suddenly realized something and stopped talking because he had thought of the worst possibility at this time.

After a while, Li Xianglan saw that the other party was silent and thought that the other party wanted to take the opportunity to ask for the price, so she took off the gold ring from her hand, took out all the cash from her wallet and handed it to Xu Tiannan and said: "Actually, I really don't know what to do now, but I saw news about you in the newspaper, and I realized that sometimes the police would ask you to help me deal with the case, so I want to ask you to help me find my sister. As long as I find my sister, these can be considered your reward."

Xu Tiannan pushed the gold ring and money back and explained: "Sister Xianglan, you misunderstood me. Although I am not a policeman, I am definitely not the one who comes first. I just need to make sure about this matter."

Li Xianglan said: "What's the matter?"

Xu Tiannan said: "Precisely because I am not a policeman, I will only help those who I think are worthy of help. Now, I want to determine whether you are worthy of helping me through something, that is, I want to determine whether you are a kind person in the traditional sense."

Although Li Xianglan didn't understand what the other party wanted to do, she immediately responded: "Okay, okay, as long as you help me find Qinqin, you can do whatever you want."

"Okay, please come here."

Xu Tiannan signaled the other party to sit in the corner of the office, then pulled out two pairs of electrostatic adsorbing stickers connected to the wire from a device covered with black cloth in the corner, and then said, "Please give me your hand."

Li Xianglan stretched out her hand, and the other party put a round electrostatic adsorption patch on both sides of his hands and his temples, and then put a blood pressure gauge on the arm socket. Xu Tiannan explained: "This is the latest polygraph invented by the Mobei Criminal Investigation Detachment. The principle is that when a person is telling the truth and lying, the skin will have different degrees of resistance changes. I will ask you several questions later. You only need to answer yes or no. At the same time, the polygraph behind you will record the true degree of your answer to each question. Do you understand?"

Li Xianglan had never seen such a high-tech thing before. She seemed a little nervous at this time. When she was about to look back at this set of high-tech equipment, she was stopped by the other party and said, "Don't move, the test has begun."

Xu Tiannan took a deep breath, grabbed Li Xianglan's wrist, then took out a picture album for children to recognize objects and put it in front of him, and asked, "What's your name?"

"Li Xianglan."

"What's your sister's name?"

"Li Xiangqin."

Xu Tiannan pointed to a red picture in the album, "Is this red?"

"yes."

Xu Tiannan pointed to a pond in the album again, "Is this a house?"

"no."

"Are you a kind person?"

Li Xianglan replied firmly: "Yes."

"Have you lied to someone?"

Li Xianglan thought for a while and replied: "I've been cheated."

Xu Tiannan pointed to the green picture again and said, "Is this blue?"

"no."

Xu Tiannan paused and suddenly asked, "Have you ever killed anyone?"

Li Xianglan was slightly stunned and immediately replied: "No!"

Xu Tiannan pointed to an airplane in the album, "Is this a cannon?"

"no."

"Are you a selfish person?"

"no."

"Have you ever stole something from someone else?"

"No."

Xu Tiannan thought for a while, "Then let me change the question. You once stole other people's things when you were a child, did you?"

Li Xianglan hesitated for a moment and said, "Yes..."

Xu Tiannan suddenly changed the subject and said, "The reason why the police station did not file a case for your sister's disappearance is because you have concealed anything from the police and me, right?"

Li Xianglan immediately replied excitedly: "No, it's not like this!"

Xu Tiannan reached out to signal the other party to Jingjing, and then asked a series of lengthy and cumbersome questions. Finally, he removed the static stickers on the other party. Li Xianglan immediately turned around and looked at the high-tech lie detector, eager to know his test results.

Murong Shui whispered to Xu Tiannan: "Boss, what do you think of this woman?"

Xu Tiannan smiled bitterly and said, "I don't think she has anything to hide. It seems that she really came to us this time because her sister disappeared and she was desperate."

Murong Shui asked again: "Then are you really going to help her?"

Xu Tiannan said: "What? You don't want to?"

Murong Shui murmured in a low voice: "Actually, it's not unwilling to do it, but I think... let's do such a small case... it's hard and thankless, just like the last 4-15 theft case. Although the Criminal Investigation Detachment asked us to assist in the case, everyone knows that we made the most contributions, but in the end it wasn't... Didn't we get anything good? We didn't even attend the commendation meeting..."

Xu Tiannan glared at the other party and scolded, "Why are you starting again? I have told you so many times. If you want to show off, go to the Criminal Investigation Detachment to be a field agent. I won't stop you. Where do you do whatever you like? Everything has nothing to do in the future."

Seeing that the other party was angry, Murong Shui quickly apologized, and then used a method of unsatisfactory to admit his mistake in a low voice: "Okay, okay, I won't complain! In the future, I promise to keep in mind your teachings, fight for the land of birth that we love, fight for the disadvantaged groups in the world, and ensure that we will do our best, devote ourselves to our efforts, and die..."

“Huh?”

Li Xiangqin, who was sitting next to her, stared at the high-tech lie detector and said in confusion, "Why is this lie detector so much like a microwave oven?"

Xu Tiannan explained: "Sister Xianglan, please don't mind, because this is really a microwave oven. In fact, there is no high-tech lie detector from the beginning. Everything I do is just to increase your sense of ritual and tension. The purpose of my doing this is to judge whether you have lie by observing your facial expressions, blood pressure and pulse when answering questions."

Li Xianglan said anxiously: "What's going on now? Can you help me find a sister?"

Xu Tiannan nodded and said, "There is indeed something strange about your sister's disappearance, so I will ask my friends from the Criminal Investigation Detachment to help you, but before that, we must understand the situation clearly. According to what you said just now, before your sister disappeared, she was with a girl named Gu Xiaobai, right?"

Li Xianglan nodded.

"Since that's the case, then take me to see the girl. I want to talk to her and ask what happened that night."

"But..." Li Xianglan hesitated: "The girl didn't know why, and she was always unwilling to mention Qinqin's disappearance. I'm worried that she wouldn't tell you either."

Xu Tiannan smiled and said, "Don't worry, just take me to see her. I will have a way to let her speak at that time."
Chapter completed!