"Didn't you find anything?" In his office, Gregory held a large stack of Polaroid photos of Kaede Hoshino in his hand, flipping through them one by one.

At this moment, the door to the office was opened again, and A, whom Qian Yu had seen before, walked in with a solemn face. "The results of the patient's lumbar puncture are out."

"Hmm," Grigory put the picture in his hand down for a moment, looking at A. "From the look on your face, the cerebrospinal fluid is definitely not clear."

"Yes," A nodded with some solemnity. "The results of the lumbar puncture have red blood cells, which can be determined to be intracranial hypertension caused by cerebral hemorrhage due to cerebral artery malformation."

"Open the floodgates," Grigory picked up the photo again. "I don't need to teach you exactly how to do it, right?"

"Cranial perforation," A nodded. "Let's go and get ready for blood pressure reduction now."

"What's the situation?" When A left, Kaede Hoshino frowned. "Are you already going to have a craniotomy?"

"It's not about myopia anyway, (Author: Intracranial hypertension can cause myopia)" Grigory picked up the stack of photographs again, looking at them one by one, and flung them onto the table in a card-dealing gesture - he was so skillful that all the photos were re-stacked on the table after making an arc in the air. "Koji Nagano suddenly fell into a coma while doing a central nervous system examination, so ......"

At that moment, Gregory's hand suddenly stopped, and his eyes stopped on the photograph that was almost sent out in his hand.

In that photo, the cabinet door was wide open, and it was densely packed with all kinds of instruments.

But Gregory's gaze was fixed on something other than the contents of the cabinet.

Above the cabinet, the cat was lying in front of a full food bowl, lazily looking at the camera.

"Did any of you give this cat anything to eat?" Gregory narrowed his eyes slightly and looked at Kaede Hoshino.

"Theoretically, no," Kaede Hoshino shook his head. "This picture was taken earlier than the one we took, and that's what the bowl looked like when I went in."

"Did the patient eat lunch at the hospital?" Grigory asked again.

"No," Kaede Hoshino shook his head. "I asked the nurse to arrange a high-energy snack for him to replenish his blood sugar before the CT scan, but he said he didn't want to eat at the time, so we just injected him with a small amount of glucagon in the end."

"......It's funny how a diabetic who hasn't eaten lunch doesn't want to eat," Gregory said, standing up. Hoshino, you immediately go and pause the craniotomy, delay it for at least an hour and a half, and keep them connected, and then we'll meet at my car. ”

……

Thirty minutes later, Nagano House.

Wearing a gas mask and a chemical suit, Gregory entered the Nagano Mansion through the main entrance with Kaede Hoshino, who was similarly dressed, and Chiba was left outside the door and warned to hide in a hidden place.

"All the windows are closed," Grigory ordered, and he himself closed one of the windows next to him at the same time. "Then use that thing of yours to test the poison gas out."

Kaede Hoshino held a white ball wrapped in a metal outer skeleton in his hand and nodded.

For a cat of that size, the amount of food in the cat's food bowl is only two meals at most, but the cat food bowl is still full when the cat food is not replenished for at least six or seven hours after noon (Hiroshi Nagano's illness), which means that the cat may not have eaten.

Considering that Mr. Hiroji Nagano also suffered from a loss of appetite, it is likely that it was some kind of external toxin. At the same time, Hoshino Kaede and the others stayed in Nagano's house for a long time without any abnormalities, which indicates that this toxin is likely to be a toxin that needs to be impregnated for a long time to take effect, that is, a gas toxin - which is why Gregory asked to close the windows.

All the windows were closed one after another.

Kaede Hoshino pulled out a layer of open skin with a single stroke on the white ball, and in three clicks and two clicks, the entire white skin was torn off, revealing the glass balls covered with various test strips on the surface of the ball.

These test strips correspond to more than 100 kinds of toxins that are commonly found in the room, and can basically cover any kind of toxic gas that may appear in the room. However, it took some time for the test strips to react, so before the test strips reacted to a specific poison gas, Gregory and Hoshino Kaede began to search the entire Nagano Mansion to see if there were any possible sources of the poison gas.

"......" Gregory walked into Nagano's room, only to find that the scene was almost identical to the one in the photograph - even the cat was looking straight ahead as in the photo, undenied by his arrival.

It seems that the cat has died, and the cause of death is the cause of Mr. Hiroji Nagano's illness.

With that in mind, Gregory stood in Hiroharu Nagano's room, looking around the walls and observing everything around him.

It seems that Hiroharu Nagano is used to sleeping on the ground, and this large sheet on the floor is the best proof of this - Gregory also lifted the sheet and checked it to make sure that there was no source of poison gas underneath.

As he stood up, Grigory's gaze rested on what looked like a central air-conditioning vent above the door.

“？” Grigory raised an eyebrow, then looked at the same height behind him—an air conditioner was hanging there.

[In the case of air conditioning, there is still central air conditioning? Wait a minute, isn't it ......] Grigory suddenly thought of something, and then walked to the window and looked out. After noticing nothing, he walked back to the living room of the Nagano Mansion and looked out through a window with a wider field of view.

Night had completely enveloped the land, and most of the houses in the vicinity had turned on their lights to a greater or lesser extent, except-

Gregory's gaze was fixed on a dark house next to Nagano's house. Compared to other residences, this residence seems to be exceptionally close to Nagano House. Gregory could even see a pipe embedded in the wall of the house over there, buried in the ground.

Gregory glanced to the side and saw that the Nagano Mansion also had a pipe buried in the ground on this side. [Wait, the height of this pipe protruding from the Nagano Mansion seems to be higher than the ceiling?] 】

Gregory suddenly lowered his head, the corners of his mouth slightly hooked.

"Gregory," Kaede Hoshino's voice sounded behind him. "Toxicology tests have found a match, yes-"

"Methyl bromide?" Gregory turned his head and looked at Kaede Hoshino with a look of enlightenment that had seen through everything. "Really?"

"Yes!" Hoshino Kaede was stunned. "But how do you know?"

"Let's go back, we'll talk about it when we get back."