The smell of ash spread throughout the castle, especially in the almost completely closed environment, making it even more difficult for everyone to breathe.

However, the most important thing now is not this, the common goal of everyone now is to find Smith, the undercover agent who has been hidden for a long time.

Lao Shi is at the forefront, he is also the person who has studied this castle the most, he has been to basically every place, and knows it well.

But he didn't find Smith's shadow in this place, which not only made him a little puzzled.

"Will he still be able to fly from here?" Lao Shi frowned and said. "It's not impossible, if he's really undercover, it's reasonable to know some secret passages that we don't know..."

"But, where is that place hidden?"

As a former criminal police team operator, he still has basic professionalism.

The most basic thing is trace detection, to put it in layman's terms, it is to find footprints.

Although the castle was smoky, he could see the marks on the floor and many footprints, but he had already checked everyone's shoes here, including the specific shape of the footprints, and it was only a matter of time before he could find Smith.

The others just followed the old stone stupidly, not knowing what to do.

"Watch for any strange marks under your feet, and tell me immediately if you find one!"

Lao Shi didn't have so much patience, after all, he was misunderstood, he didn't want to care about these people anymore, and he could know who was the undercover agent by surviving alone until the end.

But now that the undercover agent has revealed his feet, this undoubtedly gives him a chance, a chance to discover the truth behind the game one step closer.

Several people walked briskly to the fourth floor, and the kitchen and bathroom Lao Shi didn't want to investigate, because there were no useful clues left.

Not only because it's a dead end, but also because it's a mixed bag, and many people have been to both places, so the footprints on the ground are so intricate that you can't tell which one is Smith's.

Simply, he gave up these two areas and chose the fourth-floor hospitality room where it was easiest to distinguish footprints, and if not, he could turn around and go back to the second and third floors.

"There's no strange sign of that, is there?" Xia Ruping frowned, her eyes were like copper bells, and she stared at the ground tightly, but she didn't seem to find anything and didn't find anything.

"Try to find a footprint with an arrow," Old Shi whispered. Something like that can be..."

However, he seems to overestimate the abilities of others, and in the end, he has to rely on himself.

The first element needed for trace detection is patience, but at this time, they have just experienced a fire, and they can't concentrate on doing this at all, and only a professional like Lao Shi can do it.

"Finally let me find out..."The corners of Lao Shi's mouth curled slightly. You're really making it easy for me to find..."

I saw that in an inconspicuous place in the corridor, there was half an inconspicuous footprint, and that was Smith's.

But strangely, the presence of this footprint does not look like a normal walk, but more like walking on the ground.

Lao Shi's first thought was that he should have deliberately hidden his whereabouts, so he adopted this way of traveling.

"The footprints are pointing there, everyone follow up!"

Footprints all the way to a room, the room is in the innermost part of the fourth floor, there is generally no one to live here, after all, it is too remote, if there is anything not very convenient.

"He actually ran to such a place, and he really had a weak heart!" Ellie exclaimed.

"When we find him, everything will be clear..."

Lao Shi waved his hand, let the people behind him quiet down, avoid startling the grass and snakes, and slowly came to the door of the room first.

Gently pushing the door, the door was locked without any accidents, but he didn't panic, as an experienced police officer, he could still handle such small things.

"Do you have a hairpin? Lend me one..."Lao Shi turned his head and asked a few people behind him.

"Yes!" Ellie nodded, reaching out and pulling the other hairpin off her head. "Here you go!"

Lao Shi took the hairpin and opened the door in a few clicks.

When the door opened, there was a cold wind, unusual in a closed castle.

You know, there is no cold air anywhere here, except for the refrigerator in the restaurant on the second floor, which is obviously very abnormal.

Lao Shi was the first to enter the room, the room was quite bright, and the decorations inside were similar to those in other rooms, but this strange temperature really made him a little concerned.

Everyone went into the room and began to look around the room.

"Why is it so cold in here? Is the air conditioner on? ”

"There's no air conditioning here..."Xiaowen looked at the roof. I made a special search that day, and I didn't find an air conditioner in any of the rooms here, and it doesn't seem to be installed here..."

"What? Did you find it for your family, Ellie? Tian Chengming smiled slightly. Are you really caring? ”

Xiaowen didn't speak, just smiled awkwardly, and turned around to wander around the room again.

"Come! The cold air seems to be coming from here! ”

At this moment, Xia Ruping seemed to have found something in this room, and everyone hurriedly leaned towards her.

"You see, this ventilation duct is always pumping cold air into here!" Xia Ruping said quickly.

"But does that have anything to do with that Smith?" Tian Chengming tightened his clothes. "Don't you tell me he's got into this?"

"Looks likely—" Old Shi leaned down and looked in through the gap in the ventilation duct. This ventilation duct is big enough for an adult male to enter, and although it may be a little cramped, it can still accommodate it..."

"So what do we do now? Do you want to get into here? I don't want to! Ellie pouted, looking reluctant.

"If you don't want to go, you can stay here, I'll go by myself!"

Lao Shi removed the iron net blocking the pipeline, and after removing it, he was even more convinced that the source of the cold wind was here!

I saw the old stone climb in. The crowd began to look at each other, and although they all wanted to help, none of them had the courage to climb into that pipe, and if they were trapped in it, the results would be unimaginable.

The old stone slowly climbed in the pipe, and looked behind him from time to time, crawling forward as he looked.

"Sure enough, none of these people can be trusted! At the end of the day, it's up to you! ”

Anger is anger, there is no way back for me, and it is even more impossible to turn around, so I can only crawl forward slowly.

The further he climbed, the cooler the temperature became, until he came to another pipe opening, and the temperature gradually rose.

"Looks like this is it... Huh! ”

Lao Shi pushed the iron net in front of him hard, opened the passage, and jumped in.

It was a closed room, surrounded by a white mist, and if it weren't for the dim yellow light on the roof, he wouldn't have noticed the three open refrigerators around this room.

In addition to the refrigerator that kept revealing the cold air, there was also an operating table, and there were some untreated blood stains on the bed.

In front of the left side of the bed, there is a table with some surgical instruments on it, as well as some test tubes and papers.

"Looks like this should be an operating room..."Lao Shi came to the table and picked up a scalpel. Or is this the first crime scene? ”

In addition to these, there were countless small jars in the refrigerator, and since they were all covered in frost, he didn't know what was in them, but he could probably guess that there wouldn't be anything too friendly here.

There seemed to be nothing to be found in the room, but the documents on the table made Lao Shi's eyes light up.

"This is?!"

The first page of the document reads, The Avengers Project.

"Do you have anyone you want to kill? Or, do you have someone you don't want to see again? We can help you make that happen, and for a small commission, we can help you do what you want to achieve..."

"But, only if you join the program too!"