The rooftop of a business building.
Xiao Yao squatted on the concrete floor and looked at a trace circled by chalk on the ground.
"This is where the bullet casings are placed."
Zhao Cheng's face was gloomy, with sparks of anger flashing in his eyes, "7.62×51mm, international standard rifle cartridge case." ?.?????.???
Why angry?
Because a sniper was provoking Longguo Guoan and deliberately left bullet casings at the scene!
Eyes of a Hundred Eagles, open... Xiao Yao raised his head.
He looked towards the river bed five hundred meters away and saw a two-story building.
There, it was the secret meeting place between the spy Liu and the intelligence personnel of Sakura Country.
At that time, the sniper was on the rooftop of the business building, killing the spy Liu.
Closed the Eye of the Hundred Eagles.
Xiao Yao's vision returned to normal and fell to the ground again.
You can see obvious footprints on the ground, but they are not shoe prints.
The opponent's shoes should be covered with 'shoe covers'-type items...anti-reconnaissance.
Xiao Yao's eyes followed the footprints and looked towards the safe entrance of the rooftop, "The surveillance in the building didn't detect the other party's whereabouts?"
"That's what's weird."
Zhao Cheng shook his head, "The surveillance in the building has not been damaged. Anyone who has entered this business building will appear in the surveillance view. However, after investigating all the people who entered the building at the time of the incident, no suspected suspects were found. Sniper personnel.”
"Has the exterior wall of the building been checked?"
Xiao Yao stood up and walked to the edge of the rooftop and looked down.
"All four exterior walls have been inspected."
Zhao Cheng nodded, "No trace of the other party escaping from the outer wall was found."
Xiao Yao was quite surprised and became interested, "Have you checked the elevator monitoring and some escape floors?"
"right."
Zhao Cheng exhaled, "Still nothing was found."
The sniper seemed to appear on the rooftop out of thin air and then disappear out of thin air.
"I think the airspace has been checked, right?"
Xiao Yao raised his head and looked at the sky.
There are many ways to come and go without a trace.
For example, coming and going by air.
but……
The airspace in the capital is not like other cities.
For example, some people like to play with drones.
But in Beijing, people are only allowed to fly drones in certain specific locations.
It is not allowed to play in the city.
If anyone is dissatisfied, try taking out a drone and flying it more than thirty meters high.
See if the police uncle will come to you to play as soon as possible.
Talking about Beijing's airspace 'surveillance' may scare many children.
From small flying objects to large aircraft, as long as they appear in the sky above the capital.
They have all been locked in immediately!
"Checked."
Zhao Cheng nodded, "On the day of the incident, there were no flying objects or aircraft in the nearby area."
"What a hell."
Xiao Yao scoffed, "Not in the air, not on the outer wall, not inside the building. Is there any other way to escape?"
"We checked everything we could."
Zhao Cheng looked at the big boy in front of him and said, "I saw your detection and tracking methods before I wanted you to try them."
In fact, he didn't believe that Xiao Yao could find clues.
There are hundreds of investigators in the Countermeasures Division, many of whom are elites.
Do you really think these national security police are useless?
I've said it before.
Those who can enter the National Security Bureau are not easy.
Defending the homeland is the top priority!
Xiao Yao didn't ask any more questions.
Follow the marked footprints on the ground and walk towards the safe entrance downstairs.
Enter the safe passage and walk down the stairs step by step...
The business building has a total of 23 floors.
Xiao Yao walked to the 21st floor and stopped.
Because the footprints disappeared here.
"When we checked here, we found that the footprints disappeared."
Zhao Cheng said: "The investigators suspect that the other party used some means to hide their footprints."
Xiao Yao slowly squatted down and stared at the last footprint marked on the ground.
After watching it for five full minutes, suddenly.
His expression became strange, and his eyes gradually became strange.
The Eyes of the Hundred Eagles opened again, staring at the footprints in front of them.
From an eagle eye perspective, various marks on the footprints appear in sight.
I watched it for another three minutes.
Xiao Yao stood up and began to retreat step by step.
Zhao Cheng:? ? ?
What's wrong with this little guy?
A little confused, his eyelids suddenly jumped.
His eyes were fixed on Xiao Yao's footsteps.
To be precise, staring at the big boy's footprints.
Zhao Cheng discovered.
Every time Xiao Yao takes a step back, he will step on the footprints he walked before.
He stepped on the original footprints that went downstairs.
What is he doing?
After pondering for a while, Zhao Cheng quickly turned his head and looked at the suspect's footprints.
His face changed drastically!
"The footprints haven't disappeared."
Xiao Yao stepped back, stepping on his own shoe prints, and said in a deep voice: "He is retreating!"
Return to the 23rd floor, squat on the ground, and observe the suspect's footprints.
Then, he stood at the door of the stairwell and looked towards the security door on the 23rd floor.
Without hesitation, he walked in and stood in a corridor.
The 23rd floor belongs to the 'computer room building'.
Elevator machine room, fire machine room, monitoring machine room, central air conditioning machine room... and a large warehouse.
"If you escape here..."
Xiao Yao murmured, "23rd floor, how to escape?"
half an hour.
He visited every corner of the 23rd floor.
Finally, I stood in the elevator machine room.
Staring at the elevator lift, his eyes moved and looked at a piece of metal
