The taxi quickly took Sato Miwako home, and Karasawa turned the car around and successfully returned home in fifteen minutes.
As soon as he entered the door, he saw Ayako lying on the sofa watching TV waiting for him to come home.
"Are you back? I'll get you a glass of water." Ayako handed the glass to Tang Ze and said, "I didn't expect that the fire we saw yesterday would lead to a murder case."
"That's something I didn't expect, and there's not even a suspect yet."
Tang Ze gulped down the water in one gulp: "What I fear most is investigating the case. I don't know how long it will take to find the suspect.
I was planning to take a day off today, but I didn't expect to encounter this case. I can't just sit back and watch.
Sorry...it might take a couple of days for me to get out."
"It's okay. There's no rush to go out and have fun. It's okay to take a vacation after you solve this case."
Ayako said nonchalantly, "Even if I'm going out, I still have to prepare. I'll take care of the company's affairs in the next two days, and then pack my luggage and stuff."
"You don't need to bring too many clothes." Tang Ze hugged Ayako and smiled, "You can buy those there. Just bring your cosmetics and skincare."
"But then you have to go shopping with me." Ayako said with a smile: "Don't say you're tired when the time comes~"
"Then I ask for some interest today~"
Tang Ze gave a wicked grin and tried to pick up Ayako, then walked towards the bathroom amid her symbolic resistance.
A beautiful spring night, as gentle as water that drowns the heart.
The next morning, Karasawa, full of energy, went to the Scientific Research Institute, and Saito Hiroshi and his men began to expedite the analysis of the samples collected yesterday.
I originally thought there would be pressure from the fire department, but with Tang Ze as a shield and the dinner yesterday, it quietly disappeared.
But even so, it still took them a whole morning to complete all the tests.
Among them, most of the analysis results are the same, and only one of the curve charts is completely different from the other analysis status charts.
This substance, which is completely different from the previous lamp oil, was found to be sodium carbonate after testing!
After confirming this, Saito Hiroshi immediately simulated the layout of the crime scene.
A piece of white paper covered with squares was marked red one by one by the other party.
"I'm marking the area covered by the oil, and the plastic buckets of oil are on the shelf on the far left."
Saito Hiroshi placed a blue button here to represent the location of lamp oil.
He then placed a red button in the opposite direction of the fire: "But the fire point identified by the fire department was found several meters away from the shelf."
“That’s a really odd point.”
Tang Ze touched his chin and said, "It's impossible that the prisoner put the plastic bucket back after spreading the lamp oil. This behavior is not in line with common sense."
"That's right. So after that, I listed the area between the fire point and the barrel. The red area is the distribution map covered with kerosene."
Saito Hiroshi pointed to the red squares and said, "These red squares are covered by oil lamps, but the area identified by the Fire Department as the initial point of fire, where the cigarettes were, is not covered by lamp oil.
Instead, the area where the shelves containing the barrels were located had traces of being covered with lamp oil."
"So, the Fire Department's judgment that cigarettes were the cause of the fire was wrong, and the real cause was something else."
Tang Ze narrowed his eyes, a sharp look flashing in his eyes: "Judging from the current situation, the plastic barrel containing lamp oil should be placed on the shelf.
But then the fire ignited the plastic barrel, causing the lamp oil to leak out and spread everywhere, which is more logical."
"But if an arsonist wants to set a fire, it is normal to spill lamp oil in the house." Takagi, who was listening to the discussion between the two, expressed a different opinion.
"That's what sodium carbonate is all about."
Saito Hiroshi explained, "If it was really the cigarette that ignited the lamp oil, then sodium carbonate shouldn't have been present at the crime scene.
When I was analyzing the lamp oil on the floor material, I accidentally discovered substances such as sodium carbonate.
Extremely small amounts of sodium carbonate are distributed around the ground near the fire point.
However, the fire department's identification did not find the presence of this substance."
"What does this prove?" Takagi asked somewhat puzzled.
"Sodium carbonate is a substance used in aircraft accidents to determine whether a bomb was installed on the plane before the explosion, or whether it was simply an accident."
Tang Ze explained, "For example, when dangerous goods like nitroglycerin and glycerin bombs explode, the extremely high temperature generated by the explosion will cause nano-atoms to be separated.
When individual sodium atoms combine with carbon dioxide, they transform into sodium carbonate.”
"How much knowledge do you have?" Saito Hiroshi was speechless. "You've taken over all the work I was explaining. Who is the technical staff?"
"I only know a little bit, just talk on paper. Naturally, I can't compare to you in actual combat." Tang Ze said very modestly. He only knew these because of his two skills of chemistry and bomb disposal.
Because chemistry is closely related to dangerous goods, and his bomb disposal skills require extensive knowledge in related fields, the directions of his chemistry choices are all related to dangerous types.
It is precisely because of this that he can understand such professional knowledge.
After listening to Tang Ze's explanation, Gao Mu was a little dumbfounded: "But... doesn't this mean that there are dangerous objects in the home of this elderly man in Tokyo, and then a fire occurred?"
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