He tried to find out more, but nothing happened. The detectives accompanying them were frowning nervously.

Ning Ronan looked at Xiao He.

"What the hell are we looking for, Captain?"

Xiao He kept his head down as he searched for something. He shook his head.

He always felt that certain parts of the floor were always conspicuously clean. It was as if someone had deliberately erased his traces.

Looking at the mirror in front of him, he saw the wall behind him.

There were all sorts of daily necessities hanging on a row of hooks.

The penultimate hook was empty, and the last hook held a brush that looked like the kind used to wash the sink.

Xiao He raised the camera in his hand and the shutter clicked.

In fact, he came to the bathroom mainly to look for a mop, but all he found was a red bucket.

Ye Zichen rolled his eyes and noticed that the mop was put to the side.

Just when everyone was feeling extremely disappointed.

Shaw called the agent into the bathroom.

After checking, he didn't find any fingerprints on the handle of the mop, not even some traces.

Shaw and the agent looked at each other.

There was no need for him to say anything else. This was probably the most valuable evidence in the crime scene today.

"The evidence team will bring back the mop and record down the situation. Ruonan, come with me again. The rest of you can go back. "

With that, Xiao He walked out of the room. Ning Ruonan followed closely behind.

Xiao He looked at the door of Jiang Qinglan's room. He headed straight up the stairs.

Jiang Qinglan could see it clearly from the peephole, including that look. She sat down on the sofa in pain.

"What's wrong, Captain Xiao?" Are you still suspicious of Jiang Qinglan? "

"I don't know. I just think that it's very possible that it really was him."

"With that mop?" Ning Ruonan didn't react for a while.

"Do you think that an ordinary mop, an ordinary item like this, won't even have the master's fingerprints?" Here Xiao He deliberately lowered his voice.

At this time, Ning Ruonan's pupils slightly dilated.

As they were talking, the two of them arrived at a certain house on the sixth floor.

He knocked on the door.

The person who opened the door was an aunt who was in her fifties or sixties.

Ning Ruonan smiled and said:

"Hello Auntie, can I bother you for a moment?"

"What is it? "You are …"

Ning Ruonan took out her ID.

"We would like to ask you about Grandma Zhang and Jiang Qinglan's situation downstairs? Is it convenient for you? "

"Then hurry up and come in." Auntie looked very easygoing.

They sat in the living room.

Only now did he know that her surname was Ye.

"What do you want to know? As long as I know, I will definitely tell you all in detail. "

"Do you know how their relationship is?"

"Not good."

"Why not?" Ning Ruonan took advantage of the situation and asked.

"I hear them arguing in the corridor every few days." Following that, Auntie Ye's expression immediately became mysterious, "Comrade Police, what happened downstairs?" Could it be? Grandma Zhang died? Could it be that strange smell from two days ago? "

The crime scene was sealed off from the moment it was reported.

The investigation team was also very low-key and careful. The police car's alarm was turned off before they reached the mouth of the alley. They went upstairs with as little noise as possible to avoid alerting the enemy.

So no neighbor knows what it is.

Ning Ruonan looked at Xiao He.

Why did Shaw look at her?

"Auntie Ye, the details of the case will be revealed to the public after the investigation. You don't have to worry about that for now. "

Xiao He looked at this rather gossipy Auntie Ye and felt some hope: such a person would never be able to ignore matters outside the window. They had found the right person.

"Why do they quarrel?"

"Ai, isn't it all because that woman Jiang Qinglan mistreated her child?" The old man definitely couldn't help but say when he saw this. Moreover, Grandma Zhang loved parsley the most, so how could she not care about it? This wasn't the first or second time. The injured neighbors would usually be watching celery. The woman herself refused to admit that she had hit her child. How could the old man not get angry? "

Xiao He frowned.

"Then you hear, when was the last time they had a quarrel?"

"I don't know if that counts or not. The soundproofing of the doors in our building has not been very good. "But it's not like you can hear it clearly …"

"It's fine, just say it as much as you can. Leave the rest of the work to us."

"Five or six days ago, I think. One noon, I was just getting ready to squint after lunch. The voices of those two people caused me to quarrel. "

Xiao He and Ning Ruonan looked at each other.

"Whether it's five or six days, Auntie Ye, think carefully."

"Uh-huh," she said, turning to the wall calendar. Suddenly her eyes stopped.

"It should have been six days ago. Because I had to go to see my granddaughter perform that afternoon, I wanted to quickly fall asleep."

Then, at this point in time, it really made everyone suck in a cold breath.

"Actually, I heard two of them that day, but I'm sure it was their voices. But after those two sentences, there was no more sound. "

"What exactly are those two sentences?" Do you remember? "

"There seems to be a saying, 'What are you doing here?', which Elder Zhang said. I didn't quite catch what that woman said. "

Noon huh...

Xiao He slapped his forehead.

It was all because of their carelessness. They must have thought of the scene when they bumped into each other in the corridor.

Suddenly, an inexplicable sense of self-blame and guilt arose in Xiao He's heart: It was clearly their responsibility to protect the person who reported the crime!

But now, his negligence had caused a kind old man to die a horrible death.

"Thank you for your cooperation, Auntie Ye." I hope you keep this a secret so that we can guarantee your safety. "

Xiao He stood up. Ning Ruonan's expression was also grave, as if she had thought about something.

"No problem, if there are any more problems, just come find me."

Coming out from the inside, Ning Ruonan saw that Xiao He's heart was not at ease, so she carefully asked:

"Are we going to visit a few other houses?"

"Yes."

The rest of the families could only hear the sounds of the two quarreling, but were unable to clearly hear the contents of the arguments.

Why would Jiang Qinglan go find Grandma Zhang?

Besides, this time point really matched the time predicted by the liver temperature after the autopsy.

This way, the suspicion of Jiang Qinglan suddenly increased by a lot.

The two of them did not immediately return to the station. Instead, they sat down at a noodle restaurant in the alleyway. After having a simple lunch.

Before ordering his meal, Xiao He called Peng Wenyin

"Captain Peng, arrest Jiang Qinglan." And tell her we already know about the rag and see how she reacts. "