Chapter 17 Section 16

There is a wealth of material on this point.When committing a crime at the Imperial Bank, the murderer remained calm, measured out the liquid medicine in a peaceful manner, and poisoned the person to death after careful calculation.As mentioned repeatedly in the investigative compendium, it can be inferred from his calm demeanor that he has previous experience in this field.The murderer was carrying a "Komagome-type" glass straw that was said to have been mainly used by the Army Research Institute system.The way of drinking medicine during the live performance is by no means like a layman can master.The carefulness with which the perpetrator drank the first drug himself, without suffering any actual damage, required sophisticated technique.

Every time the murderer said that dysentery or typhoid had occurred nearby, he pretended to come to disinfect.In fact, during the time at the Imperial Bank, the nearby Aida Kotaro’s house did have symptoms suspected of typhus.In the statement, Hirasawa said that he remembered the jeep when he passed by. In fact, the jeep was at the end of the alley and it was not easy to see from the street. Besides, the jeep was parked there before three o'clock. (According to the testimony of the Japanese in that jeep—the ward staff—they returned to the ward office at around 3:15.) Therefore, it was impossible for Hirasawa to see the jeep .

For the Reichsbank murderer, the occurrence of this infectious disease that must be reported and quarantined can be said to be one of his necessary conditions.Therefore, the investigative authorities believed that from the status of the murderer, he could obtain information from the Tokyo Metropolitan Health Bureau.But is it true that only the Tokyo Metropolitan Health Bureau receives such information?Under the circumstances at the time, once an infectious disease occurred, the Tokyo Metropolitan Health Bureau would inevitably report it to the Public Health Division of the U.S. Army Headquarters. Therefore, it was not only the Tokyo Metropolitan Health Bureau who knew about the occurrence of malignant infectious diseases.

The murderer had mentioned the name of Lieutenant Parker (or Lieutenant Hennett, Kirtley, or Maca) at the scene.Several witnesses heard different things, but after investigation, it was known that there was a real person. The investigation outline said: "Among the lieutenants of the occupying army that the murderer said at the scene, there were two named Parker and Cornett. According to the results of the investigation, these two lieutenants really existed, and they had indeed served in epidemic prevention work. From this we speculate The murderer may be related to them—that is, he participated in the epidemic prevention work they were engaged in at the time. Currently, we are working hard to investigate based on the above clues.”

If the names are made up out of nonsense, even if one may be right by chance, it is impossible to guess the names of two real people right at once.The murderer knew the name of the epidemic prevention officer of the occupying army clearly. From the above situation, it can be roughly inferred that the murderer was an old Japanese soldier who was employed by the occupying army to deal with bacteria or a civilian in the army.Although the man's English is not fluent, does not the fact that he can use English also help us to deduce that he is a retainer?Of course, it is not impossible to think that he may have deliberately used English in order to convince people that he was indeed under the order of the occupying army, but it is still more reasonable to think that this person is related to the occupying army.

To take this into consideration, now list the days when the perpetrator showed up at the four banks and ordered Niro Yamaguchi's business cards as follows: From 3:00 to 4:00 pm on October 14, Showa 22 (Tuesday) (Attempted crime at the Ebara Branch of Sho Yasuda Bank). Showa 23 January 17th (Saturday) at 10:00 am (customized Yamaguchi business card). On the morning of January 18 (Sunday) of the same year (take business card). From 3:00 to 4:00 pm on January 19th (Monday) of the same year (attempted crime at Mitsubishi Bank Nakai branch). January 26 (Monday) of the same year from 3:00 to 4:00 pm (Completed crime at Imperial Bank Shiinamachi Branch)

January 27th of the same year (Tuesday) at 3:30 p.m. (cash the check at Banqiao Branch of Yasuda Bank). According to the investigation outline of the Metropolitan Police Department, it is not the "date" but the "time" that should be paid attention to when investigating the murderer.The so-called "time" refers to the murderer's whereabouts during this period.But I would also like to further draw attention to the days of the week that the murderer was active.Except for the two times when Yamaguchi's business cards were customized and taken away, which were Saturdays and Sundays, the rest of the criminal days were Mondays and Tuesdays.The investigating authorities explained: "Because the first day was Sunday, the bank was busy on Monday, and the murderer came in disorder." Then how to explain it on Tuesday?I see it differently.

Could it be said that due to work, the murderer couldn't come out except on Monday and Tuesday afternoons?On Saturday and Sunday (the day when Yamaguchi’s business cards are ordered and taken away), the institutions of the occupation army system are on holiday, so you can also go in the morning.However, due to work, he is only free in the afternoon on Mondays and Tuesdays.This may have been the case when working under the occupying army system.The man who committed the crime at the Reichsbank was stuck with him probably all Wednesday, Thursday, and Friday.