Regardless of the black man in the corner who was about to shrink into a ball, Mizuma began to investigate the case in a regular order.

The first step was to understand the situation, and according to the confession of the first discoverer, Kogoro Mori, the deceased was called Ikemura Toshi, a diplomat, 54 years old.

On the same day, the deceased's wife, Ikemura Kimi, came to Mori Kogoro's detective office and commissioned an investigation - the details of which Mori Kogoro would not disclose. It just so happened that high school detective Hattori Heiji, who had come from Osaka in search of Shinichi Kudo, visited the Maori detective agency, so they went to the deceased's house together.

At the deceased's house, when they were about to visit the deceased, they found that the study where the deceased was located was locked, and after knocking on the door, Mrs. Ikemura opened the door with the key.

At first, they didn't notice anything wrong and thought that the deceased was just asleep, but when Mrs. Ikemura tried to wake up the deceased, she found that the deceased was already dead. So the police called Mizumatsuki and others. In addition to the above-mentioned persons, the house was occupied by the deceased's father, the deceased's son, and his daughter-in-law.

The forensics and coroners quickly came up with the results of the examination: the deceased had died of toxin, and a pinhole was found in the neck of the deceased, and a high concentration of toxin was detected in the muscle tissue surrounding the pinhole, apparently the pinhole where the toxin was injected.

And a thin needle was found on the ground, quenched with the same toxin and identified as the blood of the deceased, apparently a murder weapon.

Finally, the ingredients of sleeping pills were detected in the stomach pouch of the deceased, and according to Mrs. Ikemura Gongjiang, the deceased did have the habit of using sleeping pills.

That's all there is to collect information for the time being, and because I still don't have a clue, I have to further expand the search to the whole house.

Mizuma casually recorded two suspicious points in the police manual:

First, the scene is a secret room. At the end of this article, Mizuma Tsukiyo drew three arrows, pointing to the words "suicide", "forgery" and "technique", "forgery" means that the scene is not actually a secret room, and it is mistaken for a secret room after being misled by the murderer, and "method" means that the murderer used a certain method to create a secret room from the outside after killing someone.

Second, the poison needle was on the scene. Why did the murderer not take the poison needle away after killing the person, but left it at the scene? Mizuma drew three arrows, pointing to the words "suicide," "can't," and "scene." "Can't" means that for some reason, the murderer can't take the murder weapon away after killing, so he has to hope that the police won't find out, for example, the deceased's father is dizzy, if he accidentally dropped the needle on the ground after killing the deceased, it is very likely that he will not be able to see it, let alone find it. "Scene" means that the murderer actually killed the person at the scene in full view of the public, so there was no opportunity to bring the murder weapon out of the scene.

Next, Mizuma Yue connected the suicide in the two suspicious points, wrote the name of the deceased in the middle, Ikemura Move, then connected the "method" and "cannot", wrote the name of the deceased's father in the middle, and finally "forgery" and "scene", and wrote Ikemura Gongjiang in the middle.

Considering that the deceased had sleeping pills in his stomach, Mizuma crossed out "suicide" and Ikemura move.

However, between the deceased's father and the deceased's wife, Mizuma has no decisive inference.

"The police department, check your belongings, right?" Fujiwara Sakaki suggested when he saw Mizuma's embarrassment.

Mizuma nodded, which was considered to approve the suggestion to inspect the belongings, and felt a little depressed.

"Police Department! Mrs. Ikemura Gongjiang's keychain has a groove that matches the murder weapon, and there are traces of duct tape and toxin residue on it!" The voice of excitement suddenly sounded, and an forensic officer reported to Miwako Sato.

Mizuma Yuezu's mouth moved, but in the end he didn't say anything, just silently tore off the two pages of the police handbook that had just been recorded and tore them into shreds......