The sound sounded like someone playing the piano, and the melody was mournful, but it was much weaker than the normal sound, and it was easy to ignore if you didn't pay attention. The place where the sound came out was obviously some distance away from them, but fortunately, it was quiet around at night, even if it was faint, Xiang Nanxing still heard it.

"Hey! Xiang Nanxing! Yue Ming obviously heard the voice as well. I don't know if it's excitement or fear, his voice sounds a little trembling at this time.

"Let's go in and have a look." Xiang Nanxing said in a deep voice, and at the same time, he pushed open the door and walked in, Yue Ming took a deep breath and hurriedly followed. However, at this time, something strange happened, almost the moment the two of them stepped into the building, the ethereal sound of the piano suddenly disappeared.

Xiang Nanxing also paused suddenly, and at the same time raised his hand to signal Yue Ming to stop. The two stood quietly in the darkness with bated breath, and waited for a long time, but the sound of the piano never sounded again.

"What's going on?" Yue Ming asked in a low voice.

At the beginning of the operation, he collided head-on with the mysterious event, and he was obviously not mentally prepared for the excitement just now, and even his voice trembled a little when he spoke at this time.

Compared with him, Xiang Nanxing, who was temporarily pulled into the water, was much calmer. "Let's move forward." He said, "Let's go to the rumored classroom first." If things are happening, that's even better......"

He bit his lip, and there was a faint look of excitement on his face: "Then you can solve it directly, and you don't have to wait there." ”

Yue Ming glanced at him deeply: "I finally kind of understand why that senior sister with eyes above the top is interested in you." This idea is really not the way of thinking of ordinary people, it is a bit scary. ”

"You think I'm scary?"

"It might be a bit of an opponent, but I'm glad I'm teammate with you now." Yue Ming took a deep breath and took the initiative to walk in front to lead the way, "As a teammate, you feel quite at ease." ”

He looked back and smiled, "At least now I don't feel so panicked, and even a little expectant." ”

The two of them walked one after the other, and after a while, they came to the door of the rumored music classroom. In order to prevent students from entering at will, these rooms with expensive pianos are naturally locked after class, and they must apply to the teacher in charge of management to get the key to open the door. But Yue Ming was obviously ready, and he saw that he took out a bunch of keys from his pocket very casually, looked for them by the faint light, and quickly found this one in the music classroom.

"You borrowed all the keys?" Xiang Nanxing looked at him with some surprise.

"I've said I'm ready for everything."

Yue Ming said as he inserted the key into the lock hole. His fingers gripped the key so tightly that even his fingertips turned a little white. Xiang Nanxing waited for him to open the door, but found that his breathing was heavy and his shoulders were stiff, although he wanted to unscrew the door several times, but he couldn't muster the last bit of courage.

After trying a few times, Yue Ming smiled bitterly and let go. "You'd better come." He embarrassed to step out of the way, "I'm a little ......"

"If you're afraid, don't investigate any 'Seven Incredibles'!" Xiang Nanxing complained.

I didn't expect this guy who looked so arrogant to be so afraid of ghosts in private, so it's no wonder he insisted on pulling someone to accompany him. Xiang Nanxing thought as he stepped forward to hold the key, and was about to turn it, when suddenly that ethereal melody sounded in his ears again!

He was slightly stunned: this time the voice was noticeably closer, vaguely behind this door!

"It's coming, it's coming!" Yue Ming's voice next to him trembled again. He subconsciously wanted to grab Xiang Nanxing's clothes, but he grabbed a void - the latter acted immediately as soon as he heard the voice, pushed open the door and rushed in first.

"Turn on the lights!"

Xiang Nanxing gave a straightforward instruction as he rushed in, and at the same time took out his mobile phone and quickly turned on the flashlight function, shining the beam of light straight on the only piano in the room.

However, the lid of the piano was well covered, and there was no one in front of it. What's even more bizarre is that at the same time he rushed into the room, the sound in the room disappeared with it. It was as if someone inside sensed that he was coming in and fled one step ahead.

"Interesting." Xiang Nanxing sneered. Behind him, Yue Ming finally mustered up the courage to enter the door and turned on the light in the room at the same time. In the light of the incandescent lamp, the two stood side by side, slowly scanning the room in front of them.

This is a small piano room of about 20 square meters, in the center of it is a piano and the corresponding seat, there is a simple wooden cabinet more than one meter high on one side of the wall, the cabinet is placed in all kinds of piano scores, and on the top is a small pot of foliage plants. On the other side of the wall, there is a chair with a back and a small coffee table, which gives the instructor or students a place to sit while listening to the sound of the piano.

Other than that, there was nothing else in this room, let alone a person hiding here. The first thing Xiang Nanxing did was to take a closer look at the only window and find that it had been locked from the inside. Although detectives often have the kind of method of locking windows from the outside from the inside, Xiang Nanxing thought that he had just rushed into the room fast enough, and turned on the light of his mobile phone as soon as he entered the door. If someone did escape through the window, even if he was really fast, there would be no time to do such a high-precision thing as locking the window.

The windows can be ruled out, and then there is another entrance......

Xiang Nanxing slowly raised his head, and he saw the exhaust fan in the corner of the ceiling. This exhaust fan and the baffle are only thirty or forty centimeters wide, of course, it is difficult for adults to pass through, but if the other party is a child or a dwarf size, it is not impossible to pass through here.

It's just that Xiang Nanxing tried to touch the plastic baffle twice, and when he withdrew his hand, his fingertips were black, and there were a few spider webs on it. Obviously, this baffle has not been touched for a long time, and it is estimated that there are very few when it is even opened. After all, there is a window in this room, and the ventilation and exhaust ducts are just a backup.

"It can't really be a ghost, hahaha." Yue Ming tried to laugh a few times, but the tremor in his voice became more and more difficult to suppress. Xiang Nanxing's face also became solemn. "Let's look for it." "If nothing else," he said, "there should be some kind of equipment in this room." ”

"Some kind of equipment?" Yue Ming wondered.

"First of all, I can't accept the idea of ghosts or anything." Xiang Nanxing analyzed, "Just now when we were outside the door, we heard a sound in the room, but the sound disappeared after opening the door and coming in, which means that the thing that made a sound in the room at the beginning either left or just stopped making sounds." ”

"If it's the former, since the door has been occupied by us, then the only remaining passages are the exhaust vents or windows, which I have just checked, and it is basically impossible to pass through either of them, so this whole possibility can be ruled out for the time being."

Xiang Nanxing said as he poked his head under the piano and began to look for it. "And the second possibility, which is much easier to implement than the previous one." He continued, "A simple music box is enough to create a melody, and unlike the old winding ones, many of the new music boxes are electric, they can run as long as there is power, and some can be controlled remotely via an app on your phone." Thanks to advances in the manufacturing process, it can be made very small if desired, even the size of a fingernail. If I do this, I may not be able to see it even if it is put in front of me. Merely...... Hum. ”

His words suddenly changed, and then changed to a sneer. Just under Yue Ming's puzzled gaze, Xiang Nanxing, whose entire body had already been drilled under the piano, slowly retreated and crawled out, holding a small white box in his hand, on which a small red indicator light could be seen flashing rhythmically.

"What is this?" Yue Ming asked.

"That's what 'Ringing in the Night' really is." Xiang Nanxing casually threw the small box on the table. You can see that it is made of plastic, one side has several sound holes, and the sound comes out here, and the other side of it is pasted with double-sided tape, and the indicator light in the middle is still flashing to this day.

I don't know exactly how it works, but from the way it looks, it's undoubtedly a thing with a vocalizing function.

"If you look for it in the usual way, I'm afraid it's really not that easy to find." Xiang Nanxing said, "This box is not to find a corner and throw it away, but to stick it under the piano with double-sided tape, and if you don't climb down to look up, you won't find it at all." The only thing that may be in the way is this red light, but it is on the side of the double-sided tape, and it is covered with another piece of tape, even after turning off the light, you have to choose the right angle to look carefully to find it, not to mention that the person who is looking for it must turn on the light first when they come in. The person who hid it also knows the general patterns of human behavior. ”

"But I can't hide it from you." Yue Ming said with admiration. He picked up the small box and looked at it over and over again, full of interest.

"Maybe it's because the ideas are similar." Xiang Nanxing said lightly, "From the time I turned my mind to the second possibility, I was thinking about what I would do if it was me. No matter how small the sound equipment is, there are only a few places to hide things in this room. The four corners are unobstructed, the chair and the coffee table are not places to hide things, and the baffle of the exhaust fan has not been removed for a long time, so the most suspicious place is the wooden cabinet next to the wall, and the piano in front of us. ”

"But the piano is a very delicate instrument, and the people who will come here to practice the piano are also those musicians who have very good ears, and if you put something inside the piano, it will undoubtedly affect its timbre and make people hear the problem all of a sudden. So this thing can only be placed outside, either under the piano, or inside or under the seat. I was lucky enough to make a pretty short list of possibilities in my head, but I found it right on the first try. ”

"So this turned out to be artificial...... Yue Ming said in surprise, "Then what is he doing this for!" ”

"That's a question he's better asked himself." Xiang Nanxing smiled coldly. Only then did Yue Ming notice that he was no longer in the position where he was standing. As he spoke, Xiang Nanxing had been walking slowly, and in a few words, he almost walked to the window against the wall. As soon as he finished speaking, he suddenly took a quick step forward, and at the same time poked his head out of the window. This series of movements went from slow to fast, it was like a flash of lightning, and it was a sudden attack.

"I see you!" He shouted.

Right under his nose, a dark shadow was visibly startled by his actions, and as soon as he turned around, he ran away lifelessly into the distance.

"Chase!" Xiang Nanxing picked up Yue Ming, who was still in a daze, turned around and rushed out of the room, and rushed downstairs!

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