The knock on the door and the sound of rapid breathing woke Tang Xian, and Luo Qi'an swept Tang Xian's mouth with his tail to signal him to be quiet.

The thing outside the door knocked on the door of 2001 and 2002, and when he waited for a while and saw that no one opened the door, he turned around and went downstairs to continue knocking on the door, accompanied by the sound of footsteps downstairs and rhythmic knocking sounds, Tang Xian's mind appeared the appearance of a person dragging the corpse downstairs.

Luo Qi'an glanced at the time on his mobile phone and found that it was only three o'clock in the morning, yawned, and went back to sleep in Tang Xian's ear.

The things at the door went from three in the morning to six in the morning.

At eight o'clock, Tang Xian swayed downstairs with the cat, because he didn't sleep well at night, Tang Xian was a little dizzy, the corridor was still dark, no one came out, Tang Xian could only hear his footsteps and breathing. The stairs were so dark that Tang Xian stopped to identify the steps, "Click"...

Something was wrong, Tang Xian pinched Luo Qi'an's claws, and there was a sound of footsteps.

Luo Qi'an put his two paws on Tang Xian's shoulders, looked behind Tang Xian and said, "It's okay, go on."

Luo Qi'an saw a long-haired woman, followed Tang Xian step by step, and when Tang Xian walked to the 9th floor, the woman who followed disappeared.

The 9th floor is much more lively, although there is still no one in the corridor, but you can hear the sound of husband and wife talking and children crying in the room.

When he arrived on the first floor, Lao Chen was squatting on the ground to sort out the potatoes, and Lao Chen was a little surprised when he saw Tang Xian coming down, "I came down so early, didn't I encounter anything?" Tang Xian shook his head and said tentatively: "Will anything happen if you come down early?" Lao Chen said with a smile: "It's nothing, it's just that the corridor lights are dim, I'm afraid you will fall."

"Uncle Chen, I'll help you divide the potatoes", Tang Xian proposed, Lao Chen wiped the sweat that didn't exist on his head: "Okay, you put 20 potatoes in a pile, a total of 6 piles, pay attention to the fact that each pile of potatoes must be the same size."

Tang Xian put Luo Qi'an on the ground and squatted down to pick potatoes, while Luo Qi'an squatted opposite Lao Chen to look at Lao Chen, "You cat is quite spiritual", Lao Chen chatted with Tang Xian.

"Well, I've been raising it for more than ten years, and I'm seventy or eighty years old", Tang Xian also came with his mouth open, Luo Qi'an flicked his tail, and Lao Chen exclaimed: "Yo, then this cat is bigger than me."

"Uncle Chen is also in his fifties", Tang Xian took the opportunity to inquire.

Lao Chen shook his head: "It's almost seventy, it's old."

When Tang Xian divided 6 portions of potatoes and Lao Chen also divided the remaining 20 portions, Tang Xian asked suspiciously: "Uncle, why are you dividing 6 in a pile?"

Lao Chen rolled up a cigarette and took a puff and explained: "Some people don't have a family, they give 6 if they live alone, and 20 if they have a family."

"Uncle Chen, morning", at this time, the first resident who came to pick up potatoes appeared, it was a man in his forties, Lao Chen smiled Nunu's mouth: "Wait there first, wait for everyone to come down, there is something to say today."

People came down one after another, Lao Chen looked at the crowd and clapped his hands: "Everyone is quiet, everyone understands the situation in our building, as long as we insist, we can get a lot of money, we have always been very united before, but this month, some people have thoughts that they shouldn't have."

"How so? It can't be...", the crowd retorted.

Lao Chen coughed a few times, and the crowd quieted down again: "The iron door can be opened by no one except me, no outsiders come, and those who pretend to be ghosts can only be their own people, this time I invited 5 detectives, you must actively answer their questions, find out the traitor as soon as possible, and drive the traitor out"!

"Get out! Get out"! The crowd responded positively.

Lao Chen smiled with satisfaction and turned his head to Tang Xian and the others and said, "You come to distribute potatoes and steamed buns, just recognize people, and you can come to the door or contact by phone after getting acquainted."

"Hello detective, I'm a 201 resident, I'm...". After the potatoes were distributed, Tang Xian and the others also remembered about the same, Lao Chen sat on the rocking chair by the iron gate again, and waved his hand: "They are in a hurry to go back to cooking, you go to the door and ask, by the way, Xiaotang, you will go up and bring the potatoes of 2001 later, it is inconvenient for him to go downstairs."

Tang Xian and others entered 401 to exchange information.

Tang Xian spoke first: "I came down early today, and when I went downstairs, there were footsteps following me, and the footsteps disappeared on the 9th floor." According to the clues, the 2nd to 9th floors live alone, the 10th to 20th floors live alone, Akui lives alone, and there should be 7 families who send 20 potatoes, but only 6 families came to receive them today, and no one came to 601."

"That's not right", Aqua said in a rough voice, "Why is my room 702 and not 701"?

Li San proposed: "Let's go to our own room first"?

Xiaomei and Ah Hong's room has been basically cleaned, and Xiaomei said: "I should have lived in a family of three before, with baby products, women's skirts, and some cigarette butts and wine bottles."

Akui's room didn't move much, only set up a tent in the living room, looking at the messy bedroom, Tang Xian said: "There are also baby products and women's dresses."

1301 is the same as 2002, a small room separated from the middle, Xiaomei spoke: "1301 and 2002 seem to be men's residences, and the people who came to Territory Dou this morning are all men, they don't go out, these twenty or so single men are willing to be so single for a lifetime"?

"There are no more than two dozen, only 13 people came to the territory today, 1901, 1902, 1801, 1802, 1701, 1702, 1401 did not come, it should be no one to live", Tang Xian corrected.

Li San spoke: "It's useless to just guess, let's go our separate ways"?

In the end, everyone decided that Tang Xiancha was on the 20th-14th floor, Li Sancha was on the 13th-8th floor, Aquicha was on the 7th-5th floor, and Xiaomeicha was on the 4th-2nd floor.