Following Sherlock, the group walked to the room where 306 was actually 301, Sherlock unlocked it with the key to the real 301, and with a click, everyone's breath rose to their throats, holding their breath, waiting for Sherlock to push the door open.

Although he hadn't been inside 301 before, Sherlock knew what it was like inside, and how the killer had entered the room to kill the dead in 201 and then transfer to 306, all he knew about it all, and he just had to wait for the moment he pushed the door open to be confirmed.

When the room opened, Chen Yingjie still subconsciously covered her nose, and her behavior was the same as when she went to 301 (real 306) before, because she thought in her mind that there was no one living in this room.

However, this action is obviously redundant, the room is very tidy, although it is basically exactly the same, but Chen Yingjie feels a kind of familiarity, she may have been to this room before.

"What do you mean by that?"

Sherlock asked Ronan rhetorically, meaning, why is the room that no one has lived in so tidy? How do you explain it.

Luo Nan was still stubborn and unwilling to admit it, and his expression was indifferent to the point of disdain.

"What does that mean?"

There was a sharp thorn in the words, a little mean, and Sherlock was not annoyed.

"If that doesn't mean anything, what about that?"

Sherlock pointed to the window of the room, and everyone looked through it, all of them looking in surprise.

"This...... The windows are not locked!"

Lin Xi was the first to point it out, and everyone understood, from surprise to Huo Ran. Only Luo Nan's lower teeth clenched his upper lip, and his expression didn't seem to fluctuate.

"That's right, because the killer returned the key to room 201 and adjusted the order, so it's impossible to go back to 301 and lock the door, so there's only one possibility......

Sherlock smiled and walked to the window, then gently pushed open the window that was not bolted from the inside, bathed in the moonlight, breathed in the refreshing night breeze, paused for a long time, and then turned around in full view of everyone, with a very serious expression.

Suddenly, he raised his right hand and stretched out his index finger, like a ring ruler, aimed straight at Luo Nan.

"It's you! Before you kill someone, you transfer your belongings from 301 to the outside of the door, then enter 301 and lock the door inside with the key. If you use a red rope to lock the window at this time, then this murder is really a miracle, but since you haven't thought of this method, then you can only hope that no one will find out. After killing people like this, adjust the door number and put your luggage back to True 306, so that you have completed the feat of stealing the day."

Sherlock finished his conjecture in one breath, and everyone was amazed, especially Watson, who had followed Sherlock for so long and had seen countless strange cases, but this idea was really daring.

He stared blankly at Sherlock, surprised by his thoughts, and thought to himself that this man was actually the most daring, and if he went to kill, then it must be tight. The consequences of such a person in society, if left unchecked, are severe.

Sherlock glared at herself sharply, pointed her fingers straight at herself, and said a lot of words aimed at herself, Luo Nan's expression finally changed at this time, she smiled, laughed very mockingly, this is a provocative laugh, Sherlock understood.

Luo Nan applauded Sherlock's reasoning, and after clapping his hands a few times, he began to refute Sherlock.

"Yes, this idea is very reasonable, but it must also be justified, can you prove that I did what you call it?"

Sherlock shook his head.

"No, you will handle this kind of thing very well, and it will definitely be without a trace."

Sherlock really admitted it so honestly, Watson was a little surprised, Sherlock who was so cunning didn't bluff, but admitted, so did he leave any killer features?

Lin Xi also began to wonder.

"Yes, this is only reasoning after all, and it is unreasonable, not to mention that there is a more serious problem, which is the secret room! How did the Chamber of Secrets come to be?"

After Lin Xi expressed her doubts, Chen Yingjie also found a bug, that's right, Sherlock said that Luo Nan went down through the window to kill people, but after killing people, how did she get out?

"If it weren't for the red rope, the murderer wouldn't have escaped through the window, but the window is bolted here, so it could only be through the door, but the key is inside 201, how did you lock it?"

Chen Yingjie also had a series of questions, which made Luo Nan's expression look a little proud, yes, no matter how whimsical you are, no matter how much you talk about it, it is useless, you lack evidence, lack of evidence in the secret room.

"How? The Great Detective? Did the deceased lock the door from the inside after I killed him? It's interesting."

Luo Nan's pretentious ridicule made Sherlock's face not look good, and he did not refute directly, but showed a sad look, not feeling sad that he could not solve the case, but regretting that a kind girl had turned into such an unrepentant murderer.

After a long time, Sherlock slowly looked up and took something out of his jacket pocket.

Seeing such a thing, Luo Nan's whole face changed, instantly pale, and his body trembled, as if he saw despair.

"Remember this, right?"

Sherlock picked up a key in a small transparent plastic bag, and he held the key to ask Ronan.

This question made Luo Nan's whole body paralyzed on the ground, completely losing the energy to refute.

"What is this?"

Chen Yingjie didn't understand very much, to be honest, he was a little confused, so many keys, 301 and 306, which one is which? And also...... What's wrong with this key? Why is it sealed in a plastic bag? She is not the only one with question marks written in her mind, Watson, Yan Wu, Lin Xi, they are all like this.

"Let me explain."

Sherlock held the key in his palm, then turned his back to Luo Nan, who was completely out of shape, and added to the crowd.

"This key is the key to the secret room, when the murderer commits the crime, any traces can be erased, such as throwing the rope into the deep grass after killing someone, such as throwing a dagger into the sewer, but there is only one thing that cannot erase the traces, and that is this key, because it will definitely leave fingerprints."

Sherlock's tone was very determined, and then he looked at Chen Yingjie again.

"Who was the first to approach the deceased after discovering it?"

was suddenly asked, Chen Yingjie hurriedly recalled, and the pictures in her mind that she didn't want to relive were replayed over and over again, and she was stunned and stammered.

"Yes...... It's small...... Xiao Nan."