After staying in the room for nearly 30 minutes, Ouyang Xiu still didn't find out the secrets hidden in the room, because he had to go to other places to find clues, so he and Sun Yu walked out of the room, and when they came to the second floor, they met Shen Luo, but saw Shen Luo standing by the window uneasily, his eyes kept staring at the gray sky, gritting his teeth, not knowing what he was worried about.

"What's wrong, Shen Luo?" Sun Yu took a step forward and asked with concern, "What are you worried about?" By the way, hasn't Cai Jin been with you all the time? Where is he? Where did it go? ”

"I'm just worried about Cai Jin." Shen Luo sighed and told Sun Yu and Ouyang Xiu what she was worried about, "I was exploring the ancient castle with Cai Jin before, but Cai Jin received a text message and left with me halfway, I asked him where he went, he said to go back to the room, let me search the ancient castle alone for the time being, but I almost searched the entire eastern area of the ancient castle, and still didn't see him, so I searched for him while searching, but I still didn't see him." ”

"Could it be that you ran out of the castle?" Sun Yu said a conjecture, "When he came, he wasn't very interested in the outside of the castle, maybe he went to look for you after staying in the room for a while, but he didn't find you, so he went to look outside the castle to see the scenery." ”

"Of course I thought so, and I went out of my way to look for him outside the castle, but I still didn't find him. And...... I don't think he should have run out of the castle. Speaking of the last sentence, Shen Luo suddenly realized that he had said something that he shouldn't have said, and quickly covered his mouth, secretly glanced at Sun Yu and Ouyang Xiu, and then lowered his head and was silent.

"Why?" Ouyang Xiu raised his eyebrows and asked. Shen Luo's expression made him very concerned, and for some reason, he suddenly felt a sense of irritability in his heart.

"This ......" Shen Luo hesitated for a while, but still said what she was hiding, for her, where Cai Jin was more important, "When Cai Jin went back to the room, he said to me something of unknown meaning, he said that when I came back, the secret of the ancient castle would be unlocked by me, and asked me not to tell anyone else, especially Detective Ouyang Xiu." ”

"Me?" A huge question mark appeared above Ouyang Xiu's head, and Cai Jin couldn't analyze anything at all, so he could only simply think that Cai Jin was afraid that he would go to him and ask him clearly after hearing this sentence.

Thinking of this, Ouyang Xiu sighed, who did Cai Jin think of him, was he the kind of person who would quickly ask someone once he knew what important clues someone had? Well, Ouyang Xiu admitted that he would do this when he solved the case, but he wouldn't be so keen on unlocking the secrets of the ancient castle, and besides, he didn't come to the ancient castle for this matter, Cai Jin really wronged him.

"By the way, did you go to Cai Jin's room to find him later?" Ouyang Xiu thought of a question at this time, and hurriedly asked Shen Luo.

"Looked, this is his room." Shen Luo pointed to the door beside him and said, "But no one responded to me when I knocked on the door, and the door was locked, so I wondered if he hadn't come back from the room yet." ”

"I have a bad feeling when I go to Duggie and ask him for a spare key to this room." Ouyang Xiu thought about it for a while, and then instructed Sun Yu beside him, maybe it was related to the whereabouts of his dead friend, he nodded and agreed without thinking about it, and was just about to leave, when an unexpected voice sounded among them.

"There's no need to go to the master, the spare key to the East Room is kept by me." The butler who had been by Du Ji's side appeared in the sight of the three of them, and when he saw him, he took out the dusty key from his arms and handed it to Ouyang Xiu, saying, "I originally thought that I wouldn't use the spare key, so I didn't clean it, please don't dislike it." ”

"Didn't you ask me why I went into Cai Jin's room?" Ouyang Xiu took the key, glanced at the housekeeper in some surprise, and asked him coldly.

"Detective Ouyang Xiu, don't worry, you won't ask for a spare key for no reason." The housekeeper said meaningfully, which made Ouyang Xiu gradually squint his eyes, but now Cai Jin's whereabouts are more important, so Ouyang Xiu didn't ignore the housekeeper's problem for the time being, wiped the dust off the surface of the key, and in the process of wiping, Ouyang Xiu found that this kind of key was very special, and it was impossible to imitate it and make another one exactly the same.

Ouyang Xiu inserted the key into the door lock, turned the key, only to hear a bang, which means that the door has been opened, Ouyang Xiu gently pushed open the door of the room, and the next moment, a scene that surprised the four people present appeared in the room.

This is......

Ouyang Xiu gritted his teeth, what he was worried about still happened, Cai Jin, who had disappeared, appeared in the center of the room, with a very thick rope hanging around his neck, hanging on the ceiling like this, what made Ouyang Xiu even more concerned was that Cai Jin still had a thin line hanging around his neck, and the thin line was tied to a key, which looked exactly the same as the backup key in his hand.

"How is that possible?" Sun Yu's eyes widened, and he just wanted to enter the room, but was stopped by Ouyang Xiu reaching out, and then Ouyang Xiu said to the three people behind him to call the police, took out a pair of white gloves from his pocket and put them on and walked into the room.

"Wait, if you want to investigate, please let me in too!" As soon as Ouyang Xiu walked in front of Cai Jin, he heard Sun Yu say behind him, "My best friend has been killed, I must find the murderer." ”

"Aren't you afraid to be interested in detectives and reasoning?"

"Not being interested and finding the killer are two different things!" Sun Yu pleaded with Ouyang Xiu, "Please, let me be your temporary assistant or errand, I must find the murderer!" ”

"Then come in, but wear gloves and don't mess up the crime scene." Seeing Sun Yu's determined eyes, Ouyang Xiu had no choice but to agree to him entering the scene of the crime, not to mention that Zhongli Wan'er was not there, he needed an assistant to investigate this room with him, and Sun Yu was a good choice.

Ouyang Xiu first lowered Cai Jin from the ceiling with Sun Yu, Ouyang Xiu checked it and found that Cai Jin had lost his breath, and couldn't help but close his eyes, although the moment he saw Cai Jin, he knew that Cai Jin was hopeless, but he still had a glimmer of hope in his heart, and then Ouyang Xiu checked the body and found that there were no external injuries, and there was only a trace of a thick rope on his neck.

There is no trace of struggle, it should be an acquaintance who committed the crime, and may have taken sleeping pills or something. Roughly from the corpse, Ouyang Xiu looked up at the ceiling and found that this room was different from his and Zhong Li Wan'er's room, there were several things similar to hooks on the ceiling, and the rope was hung on the hook before.

"Detective Ouyang Xiu, there is no news in Cai Jin's mobile phone at all, I'm afraid someone deleted it." Sun Yu took out his mobile phone from Cai Jin's pants pocket, tapped it several times with his gloved fingers, and then showed the mobile phone to Ouyang Xiu, as Sun Yu said, the latest text message received by Cai Jin's mobile phone was sent yesterday, before Shen Luo said that Cai Jin was called back to the room by a text message, there are only two results, Shen Luo lied or the text message was deleted, the latter is more likely.

Will it be a secret room?

Ouyang Xiu glanced around, and found that there were actually two windows in this room, and the windows were not iron windows, they were ordinary windows, Ouyang Xiu walked to one of the windows, pushed the windows, and found that the windows did not move, and looked down to see that the windows were locked, Ouyang Xiu opened the lock and opened the windows, looked down, and found that there was nothing below, the position was very high, and it was impossible to jump from the windows.

"How's it going over there?" Ouyang Xiu asked Sun Yu, who was checking the other window, only to see Sun Yu shrug his shoulders, as if telling Ouyang Xiu that this window was also locked.

Ouyang Xiu thought for a while, walked to another window, unlocked it, pushed open the window, looked down, and found that this place was different from other places, there was a small house or something like a roof below, if you jumped from here, there would be no problem, but this window was also locked, so the fact that the murderer escaped from here was denied.

And then there'......

Ouyang Xiu took off the key tied with the rope from Cai Jin's neck, compared the reality with the backup key in his hand, and then inserted the key into the door lock and rotated, the key rotated smoothly, which means that the key hanging around Cai Jin's neck is the room key.

In this way, it is a complete secret room. In a small space, the windows are locked, and the key to the room is hung on the neck of the deceased, three points made Ouyang Xiu come to the conclusion of the secret room, in this regard, Ouyang Xiu Tian lips, his eyes began to burn with raging fire, and the whole person looked excited.

Secret room, the murderer really loves to play puzzles with me, since that's the case, then I'll play with you and let you know that arranging a secret room in front of me is a wrong choice.

I've taken this puzzle!