At twelve o'clock at noon, Xun Mu and Su Ping found a fast food restaurant, each ordered a casserole rice, and ate it quickly.

Halfway through eating, Xun Mu's mobile phone rang, and when he saw that it was Brother Song calling, he immediately connected and asked, "How about Xiao Song, the clue has been asked?" ”

"Hmm." Brother Song's voice came from the microphone: "According to the suspect Sun Weitian, after meeting Zhang Yuntong, he returned to his training class to teach two foreign teachers.

Then, at about five o'clock in the afternoon, he claimed to have opened an hourly room with a female classmate in college, and the two had a relationship, and then he took a shower and arrived at Yida Plaza at about seven o'clock in the evening, and met with the second Junyan and others for dinner. ”

Xun Mu glanced at Su Ping, put down his chopsticks and said, "In other words, except for the two foreign teachers, he has only seen that classmate after Zhang Yuntong met?" ”

"That's right." Brother Song replied: "It's about the murderer behind the scenes, and it's also about himself, I think he shouldn't lie." ”

"What's that classmate's name?"

"Du Xinyue."

"Huh? It's her? Xun Mu was a little surprised, and then nodded clearly: "Sure enough, it's her." ”

"You know her?"

"I just heard Zhang Yuntong say that she is the school committee of their class, but I didn't expect to get together with Sun Weitian." Xun Mu said: "It seems that Zhang Yuntong doesn't know much about his classmates and friends. I just don't know if these two are underground lovers or long-term running friends. ”

"Well, listen to Sun Weitian, it's a running friend." Brother Song said: "In addition, Du Xinyue also found something in his pocket and asked him what it was, but he didn't say it, only said that it was a good thing and he would use it tonight."

In addition, when he was taking a bath, he vaguely heard the sound of the door opening and closing, guessing that Du Xinyue might have gone out. I think Du Xinyue should have guessed something, and it was at that time that she went to get sodium cyanide and changed the medicine.

And Sun Weitian has seen a total of so many people in the afternoon, and she is the only one who has the conditions to change the medicine. ”

Speaking of this, Brother Song paused before continuing: "When I asked him last night, he didn't expect that it would be Du Xinyue's ghost, so he was embarrassed to tell us about it...... However, has Du Xinyue ever had a conflict with Junyan in the second place? ”

"It's been a trouble, and the contradiction is not small." Xun Mu replied, and said: "Let's go back and tell you this, well, Du Xinyue's address, employment address and phone number, have you asked about it?" ”

"Sun Weitian gave it to me. But just to avoid startling the snake, I haven't called yet. If you live in the address, it is relatively close to the place where Zhang Yuntong works, why don't you go to the Xun team and the Su team in person? Well, I'll take people to ......."

"No, I'll go with Lao Su." Xun Mu replied.

Hanging up the phone, he relayed the matter to Su Ping, and said, "Hurry up and eat, let's meet this Du Xinyue after eating." I think that the medicine in Sun Weitian's pocket should be what she replaced. ”

After a pause, he wondered again: "But it's a little strange, why didn't she just change the medicine in it, but replace it with the bag?" Otherwise, there are still Zhang Yuntong's fingerprints on the bag, and it will not be washed even if he jumps into the Yellow River. ”

"I didn't expect that." Su Ping was unimpressed and said:

"First, she probably doesn't know where this medicine came from, and she doesn't mean to frame Zhang Yuntong, maybe she just wants to deal with the second Junyan, and she may also want to frame Sun Weitian - with this guy's urine, it is estimated that she has also threatened Du Xinyue;

Second, she was inevitably a little nervous when she did this kind of thing, she might not be able to notice the subtle differences between the two bags, plus she should be wearing gloves at the time, and she didn't have her own fingerprints on them, and Sun Weitian would definitely inevitably touch the bag when he used it, and the fingerprints would be stained, according to common sense, he couldn't run away;

Third, don't forget, Du Xinyue also studied chemistry, so she won't know that this thing is highly toxic and can be absorbed through the skin, and the bag is so small that it is not easy to operate with gloves......

The last point, I just changed the bag and pills, and it was straightforward, normal people would do this, right? What is this doubt? How are you suspicious? ”

“emm。” Xun Mu coughed dryly: "It's me who thinks she's too smart." I just thought that if it were me, I would not touch the bag and only change the pills inside. ”

"That's because you have rich experience in investigation, and even with anti-investigation capabilities, the tide will rise, how can ordinary people have such thoughts." Su Ping glanced at him: "It's taboo to treat others with yourself, you shouldn't make this kind of mistake." What, tired? ”

"Sort of, I slept for two hours last night." Xun Mu waved his hand, picked up the bowl and quickly finished the rest of the meal, followed by a wipe of his mouth, and said, "I'm full...... Well, Komatsu also sent me the address, let's go. ”

……

"Hello, anyone?"

At the door of the unit, Xun Mu knocked on the door for a long time but no one responded.

"Not at home...... Is it at work? He asked.

Su Ping frowned, thought for a while and said, "Go to her company and take a look, Song should send you a piece, right?" ”

"It's gone, it's quite far, on the outskirts of the city." Xun Mu bowed his head slightly: "It's strange to say, she, a teacher professional student, and a girl, actually entered a chemical factory instead of teaching......

"Chemical plants?" Su Ping sighed: "Then it's quite easy for her to get sodium cyanide." ”

"Nine times out of ten, she's it." Xun Mu supported his forehead: "I'm worried that she will run away now." In addition, it's a bit strange, the chemical plant is so far away, it stands to reason that Sun Weitian can't have the conditions to run back and forth to get medicine when she takes a bath. ”

"It'll be clear when you catch someone." Su Ping said: "Well, in this way, you ask a colleague from the nearby police station to go over and ask, first make sure that the person is not there, and if he is, immediately control it and wait for us to pass." ”

"Okay."

……

Fifteen minutes later.

Xun Mu put down his mobile phone and said with an ugly face: "Sure enough, she ran away, she had already resigned at the end of last month, and her colleagues hadn't seen her for a while." ”

"In this way, she is ready to run away." Su Ping swallowed a can of Red Bull, lowered the window again, lit a cigarette, and said: "Perhaps, she had a motive to kill, but she just happened to have the opportunity to take herself out, so she decisively seized it." ”

"It's quite a headache...... Xun Mu closed his eyes vigorously, rubbed his eyebrows, and then said to Su Ping: "Old Su, you immediately notify someone to contact the relevant units to check Du Xinyue's ticket purchase and travel records." ”

"Okay, what about you?"

"I ask people to go to airports, high-speed rail stations, train stations and things like that." Xun Mu said: "If she hasn't run out of Yuqiao, maybe there will be a chance to catch her." ”