Just ten minutes after Chen Yuhan and them left the villa...

"I know the truth..."

Zhou Yixun and Cao Hongjun and their entourage of boys rushed back to the villa scene...

"Childe, who is this murderer?"

Along the way, Cao Hongjun kept asking: "Is it the maid who works in the villa, or Dean Liu who sends the carving materials?" or... Is it Zhang Zhihua, the nephew of the deceased?"

Even Concubine Zhang was a little anxious: "Don't sell it!"

"I've got solid evidence..."

Zhou Yixun returned to the scene of the murder and looked at Zhang Zhihua in shackles: "The murderer, it's you who sent Qionghua, right?"

The murderer who poisoned the dead...

"Is that him?"

The crowd looked surprised: "Then how did he do it, or how did he poison the dead?"

In fact... The appraiser is about to speak!

After Zhang Fei'er angrily reprimanded the investigators: "Listen to the No. 1 juvenile detective in Guizhou Province, how to solve this unsolved case of poisoning and murder!"

Speaking of which, it's actually quite simple...

Zhou Yixun pointed out: "To solve this case, as long as you see through the two key points, there will be no suspense!"

First of all, it is necessary to understand the so-called cyanide...

Cyanide is intimidatingly toxic, but they are not a chemist's creation, on the contrary, they are widespread in nature, especially in the biological world. Cyanide can be produced by certain bacteria, fungi or algae and is found in quite a few foods and plants. In plants, cyanide is usually bound to sugar molecules and is present in the form of cyanogenicglycoside. Cassava, for example, contains cyanogenic glycosides, which must be removed before being eaten (usually by continuous boiling). The nucleus of the fruit usually contains cyanide or cyanogenic glycosides. For example, amygdalin contained in almonds is a cyanogenic glycoside, so almonds are usually soaked in warm water to detoxify before eating.

Although, potassium cyanide and sodium cyanide are both colorless crystals, in humid air, hydrolysis produces hydrocyanic acid that has a bitter almond taste. But hydrogen cyanide (HCN) is a colorless gas with a faint bitter almond flavor. Interestingly, there are four adults who can't smell it at all.

Human activities also lead to the formation of cyanide. Hydrogen cyanide is found in car exhaust and cigarette smoke, as well as from burning certain plastics and wool. It's relatively minor, though...

So...

Zhou Yixun determined: "Cyanide poisoning does not have to be taken orally to ingest poison! It may also be poisoned in the air, and inhalation of cyanide can also cause lightning death!"

Zhang Fei'er wondered: "Then we will take the body of the deceased back for examination, just to determine the cause of the deceased's poisoning?"

Zhou Yixun shook the autopsy report in his hand: "Due to the formation of heme cyanide in the blood, the corpse spots, muscles and blood are bright red. In those who die quickly, there are obvious signs of suffocation in all organs of the body. In patients with oral poisoning, congestion and edema can be seen in all segments of the digestive tract, congestion, erosion and necrosis of the mucosa of the stomach and duodenum, and bitter almond smell in the stomach and body cavity. Patients who die from cyanide inhalation poisoning have congestion and edema of the brain, hippocampus, striatum and substantia nigra, degeneration and necrosis of nerve cells, hyperplasia of glial cells, and turbidity of parenchymal cells of the heart, liver and kidney. ”

So...

Zhou Yixun was cautious: "Although the preliminary investigation of the scene found that the symptoms of the deceased at that time were consistent, no residue of cyanide poisons was found at the scene! In such a situation, of course, we need a forensic doctor to determine the cause of death in order to confirm my next reasoning!"

Cao Hongjun interjected: "Just like a murder case, if you want to find the murder weapon! In this case, you must find proof of poisoning, such as the cause of death or the reaction of poison found at the scene, so that it can be defined as a poisoning case!"

Ignore Cao Hongjun...

Zhou Yixun continued: "Next, if it can be determined that the deceased was inhaled cyanide... Then we can, as Sherlock Holmes said, exclude all the impossible, and the rest, no matter how outrageous—that's the truth of the matter!"

The deceased had come into contact with three people before he died, and had received three special items...

The first case, let's talk about the maid first! She was arranged by the deceased to buy a blue flashlight, if he wants to poison, he should directly apply the poison on the flashlight that the deceased touched! In this way, when the deceased touches the flashlight, his hands will be contaminated with poison, and when he eats something by mistake, he is very likely to be poisoned to death!

If I were a maid, I would have done that!

Zhou Yixun thought indifferently: "After all, poisoning with air, it is impossible to guarantee that after you leave, the deceased will be locked in an unventilated secret room with a flashlight at the same time!"

The second is Dean Liu, who sent wood carving raw materials...

Zhou Yixun investigated in turn: "The wood carving raw materials on the scene have indeed undergone preliminary processing, and when the deceased carried out the carving work, he should indeed lean down and bury his head to complete the work! ”

But the odds are low...

Zhou Yixun frowned: "Root carving, one of the traditional carving arts in the hot summer, the processing of wool is usually polishing, or soaking in water before the carving work can begin." If Dean Liu will emit the toxic source of hydrogen cyanide, it will be mixed in the root carving wool. Whether it is after polishing or after soaking the deceased in water, there should be no strong toxins left..."

Moreover...

Zhou Yixun is very sure: "Judging from the carving debris left at the scene, the deceased used polishing to process the raw materials, and the slightest poison reaction was not detected in the debris!"

I see!

Tang Duoqian, who was traveling with him, reacted: "In this case... Then the suspicion of Dean Liu can be completely ruled out!"

Criminal Detective Zhang Fei'er's face changed: "Suspect, how could it be Dean Liu?"

Excuse me?

Cao Hongjun looked at Concubine Zhang complainingly: "At the beginning, I didn't know who it was, saying that Dean Liu was proficient in medical science, so the bizarre technique must be him!"

Hu Zhiwei continued: "I was so scared that Dean Liu called everywhere for help! I asked the detective for help, and I also asked the president of our reasoning research club to help investigate!"

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