Today is Saturday, and only the scheduled duty personnel of the Anding Division are on duty.

If there are no urgent matters, Li Nan and Qin Wen can also enjoy the benefit of a two-day weekend.

Today was different, though, because after having a meal at Gao Siming's house, the two had to return to Andingsi to work overtime.

Li Nan still didn't dare to step into the laboratory, so she returned to her office to continue researching the case of the mistress's death.

More than a week has passed since the incident, and there has been no progress so far.

The deceased's family, because of their daughter's status as a mistress, did not make things too difficult for Yasusada.

I only heard that Zhang Qiqi's death was quite gruesome. Apart from providing biological samples for DNA identification, Zhang Qiqi's biological mother never mentioned seeing her daughter one last time.

Similarly, Zhang Qiqi's younger brother, who was also involved with Kenjie, never showed up at the Anding Division from beginning to end.

It is said that Zhang Qiqi's entire family is now blocking Peng Zheng's house, demanding an explanation.

The Zhang family's goal was clear: they wanted Building 38 in Lakeside Moonlight. But, where in the world is there such a cheap deal?

Although Peng Zhengguo's wife was at a disadvantage in the battle for the position of empress, this does not mean that she is easy to bully.

In her view, her husband's philandering was his own doing, and she had no interest in interfering.

But now, the mistress's family has come knocking on her door, which is a direct slap in the face. The rich lady's high-class attitude has been instantly established, and she is not giving an inch.

Peng Zhengguo was also firm; no matter what, Zhang Qiqi was gone now, and the house was still his.

What business is it of yours, Zhang family? Whether it goes to court or the local judicial authorities, we'll be fine on our side. Why should we tolerate you?

Li Nan only casually inquired about the Zhang and Peng families' affairs; his mind was currently focused solely on the case itself.

How exactly was Zhang Qiqi murdered?

On the other side, Qin Wen was the only one in the spacious laboratory.

After changing into her lab coat, the first thing Qin Wen did was not to test for toxins.

Instead, he opened his private locker and took out a box from a hidden corner.

Carefully wipe the inside and outside of the box to remove all traces. Then, skillfully prepare a cup of strong acid solution and slowly place the metal box into it.

After waiting a moment, the box was dissolved beyond recognition by the strong acid. Qin Wen used tweezers to remove the remaining fragments of the box, rinsed it three times with tap water, and finally threw the wet and unrecognizable box into the hazardous waste bin.

After doing all this, Qin Wen's expression returned to normal, and she began the toxin testing, as if nothing had just happened.

Even deep within Qin Wen's mind, she had already forgotten everything about the box.

The laboratory of the An Ding Si was fully equipped, and Qin Wen confirmed in less than half an hour that the mineral water barrel contained the highly toxic blue-striped tetrodotoxin.

To reduce the harm of the toxic water, Qin Wen prepared a special highly toxic neutralizing agent to pretreat the more than ten kilograms of toxic water. She then poured it, along with a strong acid solution left by some colleague, into the laboratory's hazardous waste collection box before changing back into casual clothes and going to Li Nan's office.

Li Nan, who had been thinking in the office for more than an hour, was also a little tired. When she saw Qin Wen come in, she glanced at the computer screen and realized that it was almost nine o'clock.

"What was the result? Are you sure it's the thing you were talking about?"

Qin Wen nodded, picked up Li Nan's teacup, only to find it was empty.

Li Nan thoughtfully ran to the water dispenser and made Qin Wen a cup of water at the right temperature.

After drinking some water, Qin Wen slowly said, "It is indeed blue-striped tetrodotoxin."

Chemistry was one of Li Nan's many weaknesses, so she asked, "What exactly is this thing, and how can it be so toxic?"

Qin Wen explained to Li Nan that blue-striped tetrodotoxin is different from the previous absinthecin, which is a biological toxin that can now be synthesized in small quantities artificially.

Blue-striped tetrodotoxin, a neurotoxin, is also produced in living organisms, specifically the blue-striped pufferfish, a variant of the dark-striped pufferfish.

During artificial breeding, due to environmental and genetic mutation effects, the probability of occurrence is less than one in a million.

If aquaculture farmers discover this species, they must report it to the relevant authorities immediately and properly dispose of the pufferfish.

The toxicity of blue-striped tetrodotoxin can be described as exaggerated; just 10 ppt is enough to kill an adult!

A healthy blue pufferfish liver can only produce about 100 ppt of toxins.

The toxins found in Gao Siming's home are estimated to require at least one blue pufferfish to provide.

Based on the license plate number that Li Nan found, the seafood company that concealed the presence of blue-striped pufferfish was Jiri Seafood, registered under Peng Yuanyuan's name!

After hearing Qin Wen's explanation, Li Nan couldn't help but sigh, "I really didn't expect Peng Yuanyuan to be capable of such a vicious thing!"

"What about the follow-up to this matter? Should we report it again?"

Li Nan hesitated for a moment, "Let's follow Brother Gao's idea and keep it a secret for a while. Hopefully, Peng Yuanyuan won't do anything too outrageous!"

"I'm really worried about Brother Gao!"

Li Nan glanced at Qin Wen and said with empathy, "My Qin Wen is so much better, so gentle and beautiful!"

"Get out of here! Pack your things, go home, and hand in your homework!"

"Yes, ma'am!"

On the way, Li Nan called Gao Siming, told him the test results, and told him to be careful and stay away from Peng Yuanyuan.

He can provide daily meal care services if needed.

My dear reader, there's more to this chapter! Please click the next page to continue reading—even more exciting content awaits!