Lin Guoguo said while trying out, after he pressed the switch next to the door, the lamp emitted a red light, the lamp turned gently, and the red light hit Lin Guoguo and Nuan Nuan's body.

Nuan Nuan didn't feel anything unusual, and asked, "How does this detector distinguish between people and evil spirits?" ”

After Lin Guoguo listened, he explained how the detector distinguishes between people and evil spirits.

It turns out that after a person is illuminated by the red light on this detector, it will not react, and it will still be red light.

If the evil spirit is hit by a red light, the red light will turn into a deep purple light, and then a piercing alarm will sound.

This is Lin Guoguo's research and development according to the characteristics of evil spirits, because after the evil spirits become humans, their essence does not change, and there is still a black light on the skin of the evil spirits, but after putting on clothes, they can't see it. When the black light on the skin meets the red light emitted by the detector, it changes and turns into a deep purple light, and when the detector senses the purple light, an alarm sound is emitted inside.

Nuan Nuan listened to her grandfather's explanation and finally understood.

"Grandpa, do you still have this detector?" Nuan Nuan asked.

"There are four portable detectors developed by the scientific research center, and just now Runde sent people to take three away, and only one is left." Lin Guoguo said.

Nuan Nuan knew it in her heart, and said with a smile on her face: "If the city guards don't find Dr. Ou, then let me take the detector to find it." ”

"No, you must not be allowed to take risks, you have to go to class tomorrow." Lin Guoguo did not hesitate to refuse Nuan Nuan's request.

It was already completely dark, and solar lights were seen on the branches of trees on both sides of the street.

At the beginning, the lights on the streets of the Science and Technology City were electric lights, but with the development of science and technology in recent years, all of them have been replaced with wireless solar lights.

If it gets dark to a certain point, it will trigger the switch inside the lamp, and the solar lamp will automatically turn on.

Hurrying by under the lights were the city guards, who were in groups of more than 10 people, patrolling the streets, and if they saw a suspicious person, they would go up to investigate.

Lin Guoli had already called home and told Tang Youyou the news of Dr. Ou's arrest, and asked Tang Youyou not to wait for him and Nuan Nuan to go home for dinner.

He, Nuan Nuan and Lin Ruyi ate some biscuits to fill their muscles in a daze, and made do with a meal.

To the north of the Technopolis is an overgrown abandoned factory, with a lot of scrap metal piled up outside, and few people come here, but there are several people in black here.

In the afternoon, the Demon Sect sent people to catch Dr. Ou, and after entering the sewer, he walked along the sewer for several miles, and then came up from a manhole, and walked a hundred meters to this place, and Dr. Ou was brought here by them, locked up in a dilapidated house.

At this time, Dr. Ou had woken up, he looked at the dark surroundings, his heart was pounding, he was still relatively calm.

He knew in his heart that the evil spirit had caught him and did not harm him, and that it might have some plan.

At this moment, the door of the room was gently pushed open, and the moonlight from outside shone in.

By the faint light of the moon, he saw three men in black walk in, and the leading man had long black hair draped over his shoulders.

The faces of these black-clothed men were shrouded in black mist, and they couldn't see their faces clearly.

This leader is the demon stream, just after eating, he remembered that the captured "Lin Guoguo" has not eaten yet, so he took his subordinates and brought some fruits to fill the hunger of "Lin Guoguo".

"Professor Lin, you're awake, you're hungry." Demon Liu said expressionlessly.

When Dr. Ou heard the man in front of him call him Professor Lin, he was stunned for a moment, and he couldn't figure out the situation.

He reacted fairly quickly, and immediately understood what was going on.

He smiled bitterly in his heart, could it be that they were going to arrest that old pit and mistakenly think that I was arrested by him.

This is really a pit, no wonder I saw that old pit today, he was wearing a wig, he must have expected that the evil spirit wanted to catch him.

To be honest, Lin Guoguo really didn't know that the evil spirit wanted to arrest him, he wore a wig entirely for his personal image, and the weather was getting colder, and the older people couldn't bear it, so he wore a wig.

Lin Guoguo never expected that it was because he wore a wig that he avoided the fate of being arrested today.

"If you're not hungry, we'll go." One of the subordinates behind the Demon Stream shouted loudly at Dr. Ou.

Dr. Ou's thoughts were interrupted, and he quickly replied, "I'm hungry, do you have anything to eat?" ”

The evil spirit who spoke handed over the fruit in his hand and said, "For the time being, there are only a few fruits, you can take them and eat them, and when you get to the Holy Land of the Dark Spirit, if you behave well, we will treat you well." ”

Dr. Ou took the fruit and nibbled on it, he was really hungry, and he couldn't think so much about it for the time being, so he would fill his stomach first.

After Dr. Ou finished eating the fruit, the demon stream opened his mouth and threatened: "You will stay here honestly tonight, and don't make a fuss, or you will bear the consequences." ”

After the demon flow finished speaking, he also gestured with his hand to his neck, and the meaning was very clear.

"I will definitely cooperate with you, and I will stay here quietly." Dr. Au replied.

He paid attention to it in his heart, so he let the evil spirits misunderstand it and let them think of him as Lin Guoguo. He knew very well in his heart that if Lin Guoguo was arrested, the consequences would be unimaginable, and many scientific research would have to be terminated.

He gradually figured out in his heart that there were no more than two reasons behind the evil spirit's arrest of Lin Guoguo: one was to arrest Lin Guoguo and take them to their nest and then kill them; The second is to extract human technology from Lin Guoguo's mouth and use it for them.

The more he thought about it, the more frightened he became, and he took a deep breath, preparing for the worst.

The city guards passed by the abandoned factory several times, but no one noticed.

The city defense army encountered many suspicious characters along the way, but when they swept it with the evil spirit detector, they found nothing unusual.

Lin Guoguo and Nuan Nuan went to sleep in the lounge in the second half of the night due to sleepiness.

By the time they woke up, it was already dawn.

The city guards of Technopolis searched for a whole night, but they did not find Dr. Ou.

If it weren't for the fact that the monitoring outside the science and technology city kept monitoring the outside of the city without stopping and did not find anything unusual, the city defense army would definitely think that the evil spirit had escaped from the city.

After Lin Guoguo got up, he called Runde and asked about the situation.

Runde apologized and promised Lin Guoguo that even if the Science and Technology City was turned upside down today, Dr. Ou would be found.

Nuan Nuan looked at her grandfather sighing, and said to her grandfather: "Grandpa, the city defense army is dispatched, and the movement is too big, and it is not a way to find it like this." ”

"Do you have a good idea?" Lin Guoguo asked.