At night, Lin Jinghao borrowed the big black dog, because he wanted to see what the reason was, after the ghost building collapsed, let those stray dogs keep barking at the ruins.

borrowed a dog from Lao Wang's house, Pei Feng took the initiative to apply to lead the 'sunspot', and Lin Jinghao and Dashu followed. 'Kuroko' was also very full of emotions today, and when he was still a few hundred meters away from the ruins, 'Kuroko' suddenly began to roar, and at this time, he also began to hear the howling of dogs one after another, and the whole air immediately seemed to become tense.

"Lin Suo," Heizi began to run with Pei Feng with his strength, and Lin Jinghao hurriedly followed. In front of the ruins, Kuroko, like the other stray dogs, began to howl incessantly at the ruins surrounded by white cloth.

"Don't scream, Kuroko," no matter how Pei Feng stopped drinking, Kuroko still didn't mean to stop.

"Pei Feng, you take the dog away first." Pei Feng pulled the dog backwards, but Kuroko still walked and turned around and roared.

"You also saw it, Lin Suo, it's like this every day, but the dogs seem to be scared these two days, and there are very few dogs anymore." The big tree also rushed over from behind and said.

"Take it a little farther away." There are really not many dogs rushing into the ruins today, which made Lin Jinghao find a problem, from this way, there are many stray dogs wandering a few hundred meters away, and none of them are willing to walk into this range.

The dog is a very intelligent animal, and after being lured in for several days in a row, he will never be fooled again.

What is it about this ruin that tempts these dogs? And only within a few hundred meters? The more Lin Jinghao thought about it, the more headache he felt, and then he realized that he had taken another step forward from the ruins.

Is this temptation not only for dogs, but also for people? But why are Dashu and Pei Feng all right? ’

Lin Jinghao tried to take another step forward, no, the pain in the head injury was even worse, it seems that this temptation only works for himself and the dog.

Lin Jinghao stumbled and almost fell: "Lin Suo, what's wrong with you?" Fortunately, the big tree helped him up in time.

"Take me away." Lin Jinghao's voice was weak, and his head was already so painful that it was about to crack.

With the support of the big tree, Lin Jinghao slowly left the ruins, saying that it was strange that the farther away from the ruins, the more his headache was reduced, and when he met Pei Feng, his headache disappeared.

"Lin Suo, what's wrong with you?" Pei Feng found that Lin Jinghao's face was pale.

"Kuroko is no longer screaming?" Lin Jinghao's head didn't hurt anymore, and his spirit felt much better.

"Yes, when you get here, it stops barking, but as you move forward, it barks again." Pei Feng saw that Lin Jinghao was fine, and his face relaxed.

Kuroko squatted on the ground and wagged his tail at Lin Jinghao. Lin Jinghao touched the sunspot's head, his brows furrowed.

'Do you have the same symptoms as a dog?' It seems that this ruin is not simple at all! It's a pity that she can't contact Xia Mingyue now, otherwise, she must know why this is happening? ’

"That's all for today, Pei Feng, let's return the sunspot together, big tree, you can look around again to see if the other dogs are in the same situation?"

Lin Jinghao and Pei Feng took the sunspot back to Lao Wang's house again, and it was strange to say that the sunspot never happened any more abnormally along the way, and when they saw Uncle Wang, they pounced directly.

"How? Director Lin, can you help? Lao Wang saw Lin Jinghao's tired look on his face and asked with concern.

"Actually, there was a discovery, but the cause has not been identified?" Lin Jinghao replied.

"Pei Feng, you go out first, I'll talk to Uncle Wang." Lin Jinghao faintly felt that Uncle Wang might be able to help him answer the questions in his heart, but he didn't want Pei Feng to hear it.

Pei Feng walked out, Lin Jinghao turned around and closed the door, pulling Uncle Wang aside: "Uncle Wang, is there anything that can attract dogs, do you want to go to one place?" ”

"There are many ways to attract dogs, meat, dogs' own feces and urine, but as long as my sunspot is not something I give, it will not take the initiative to eat it. If you want to get a lot of dogs to go to one place at once, unless..."

"Unless it's something..."

"Did you know that there is a thing called the dog flute, which is the most useful gadget specially used to retrieve dogs?"

"Dog flute?" Lin Jinghao seems to have heard the name there.

"Yes, the canine flute emits an ultrasound that is not perceptible to the human ear, but is very noticeable to dogs. Because dogs' ears can receive sound waves of 120 kHz, while humans can only hear 20 kHz at most. In addition, the canine flute, in addition to the tubular sound that humans can hear, the sound he makes at the same time is exactly the frequency that humans can't hear, only dogs can hear. Moreover, ultrasound at this frequency travels far away, so dogs can hear this sound from a great distance. ”

"Uncle Wang, how do you understand so clearly?"

"Well, the hunters in ancient times used the dog's specialty to make a dog flute, which could easily call back the dog that had chased the prey and ran away. You haven't had a dog, and you haven't dealt with military dogs, so of course you don't understand. ”

"So there's such a thing? But why does my head hurt too? ”

"Does your head hurt?" Lao Wang glanced at Lin Jinghao with concern.

"Yes, when I walked there, the closer I got, the more headaches I have, and the farther away I don't hurt, is it the same as the dogs?" Uncle Wang's statement, although it can explain the dog's problem, but how to explain his own problem?

"You... I remembered that the last time you were in a coma, Dr. Xia once told me, is there still a piece of shrapnel left in your head? ”

"yes, does it matter?" Lin Jinghao didn't want too many people to know his secret.

"As far as I guess, this should be related to the iron piece on your wound, and you'd better not let more people know your secret in the future. Otherwise, it will become your fatal weakness in the future. "Uncle Wang is very reasonable, if the criminals know about his weakness, it will become a weapon they use to attack themselves.

"I know, Uncle Wang, you have a good rest, and I'll come to see you and Heizi another day."

"Yes, son, if I see your father that day, I must remember to ask him to come to my house for a drink."

Walking out of Uncle Wang's house, Lin Jinghao immediately made a call to Dashu, and after confirming that he was still at the scene, he immediately asked him to call a few policemen at the scene to search the ruins overnight to see if there were still hidden devices such as 'ultrasonic transmitters'.

Calling Pei Feng, the two rushed to the ruins again, and he also wanted to see with his own eyes whether there was really something like what Uncle Wang said.

Parking the car far away, Lin Jinghao now had palpitations, and he didn't dare to approach the past easily.

"Pei Feng, take a look and see if they have found anything in the big tree." Lin Jinghao got out of the car, feeling fine, and didn't seem to hear any more dog barking.

Ten minutes later, Pei Feng walked over with a big tree and a rectangular object: "Lin Suo, there is really a discovery." ”

In the distance, the big tree screamed, and as the big tree approached, Lin Jinghao's head felt pain again: "Big tree, you turn off that ghost thing for me." Lin Jinghao made a stop movement.

"Ah, okay, turn it off." Pei Feng hurriedly blocked the big tree, and on the rectangular object, he rotated the button.

With this action, Lin Jinghao's headache disappeared immediately, and even Lin Jinghao couldn't believe that this was the truth.

"Lin Suo, what's wrong? You won't have another headache, will you? Dashu hugged the device, stepped forward, and said embarrassedly.

"It's okay, where did you find this thing?" Now Lin Jinghao is concerned about the location of this equipment.

"It was found right in front of the murder of the old scavenger, under a pile of rocks about two meters or so. It has been confirmed that this is a homemade ultrasonic transmitter with a large capacity battery, and it is always in working condition. Xiao Wang said that this thing should be the cause of the dog's barking, but it is harmless to the human body, and I don't know who made the prank? ”

The Xiao Wang mentioned in Dashukou is an 'telecommunications' expert in the institute, and what he said should not be wrong.

"The location is directly in front of the victim? Doesn't that mean... It should be the seat where the murderer is right? Quick, let's go check it out! Lin Jinghao posed, and suddenly as if he remembered something, he raised his legs and walked towards the ruins.

"Lin Suo, doesn't your head hurt?" The big tree shouted from behind.

Passing under the white cloth, in the place where the old scavenger was victimized, the stones there had been cleared, and Lin Jinghao's head didn't hurt anymore.

"Lin Suo, this is the place." Dashu Pei Feng followed in with Xiao Wang and another policeman.

"Pei Feng, did you think of anything?" Although he had an idea in his heart, Lin Jinghao still wanted to listen to other people's opinions.

Pei Feng took a step forward, he gestured, and after thinking about it for a while: "At that time, the deceased accidentally walked in, and happened to see someone hiding something here, so... was wiped out by someone! ”

"But... Still can't explain why the old man was drained of blood? Pei Feng thought of the process of the case, but some things were still not clear.

"That's not easy, the murderer is a vampire himself." After Dashu finished speaking, he couldn't help but gasp.

"If this murderer himself wants to create the fact that there are vampires here!" Hearing the conversation between the two subordinates, Lin Jinghao began to strengthen his thoughts.