Li Su was stunned, and found that it was the blonde girl he saw before who was knocked down, and it was the old man who was pulled aside by Chu Zihang. Before he could explain anything, Li Su directly approached the person who fell from the building and reached out to grab his wrist. Two seconds later, he shook his head at Chu Zihang. Falling from a high altitude and landing on his head, he was too dead to be dead anymore, and bright red blood spots spread around him. Li Su tilted his head slightly and saw his face clearly. It was a middle-aged man I had never seen before, with a scruffy beard, deep-set eye sockets, and a thin complexion. In addition to this, there was a thin, bleeding wound on his neck.

The wound was like a sharp knife as thin as a cicada's wing, as thin as a ...... The wingbones of the scythe!

"Hold the corpse! Don't let anyone around you get close! From now on, no one is allowed to leave! Li Su yelled at the security guard who had just arrived. He didn't have time to care about him, and if he heard it clearly, he reflexively went straight to the city hall. The moment he turned around, he took out his mobile phone and dialed: "Norma! I want to be able to pass the entire ban authority of the town hall! Right now! ”

"A-level commissioner Li Su, voiceprint confirmed." Norma's emotionless voice came from the speaker, while the green numbers on the phone's screen flashed. Chu Zihang obviously understood what was happening, and followed him closely, and they passed through every hall and corridor at high speed, and the tourists who passed by them all looked curiously at the two young men who were sprinting for a hundred meters.

After passing through the metal gate marked "Tourists Stop", there were no more tourists, Li Su untied the knife bag behind his back and threw it to Chu Zihang with his backhand, and when his hand was withdrawn, his feet were also upside down, and the long ruler was hidden behind his arm, ready to go.

Halfway through the floor, the two ran separately in different directions, but neither of them got lost. Li Su kicked open the iron door of the rooftop, and while jumping out, his hand turned outward and his speech spirit expanded, and he was now able to deal with attacks from any direction.

But no one attacked him, and the rooftop was calm. Vigilant, he walked slowly past the sun-reflecting skylight, past the humming air-conditioner, and onto the staircase that led to the edge of the rooftop, as the field enveloped the entire rooftop.

But I didn't find anything.

The tops of the two towers in the city hall were inward-struck, and when he walked to the edge, Chu Zihang also appeared at the top of the rooftop on the other side, and the two looked at each other from a distance, both slowly shaking their heads, obviously not finding their targets, and the other party had already fled.

However, his luck seemed to be better than Chu Zihang's, and he found blood stains in the corner of the rooftop. The blood was a fresh, bright red, and most of it hadn't had time to dry up. He waved to the other rooftop, signaling that he had found something, and crouched down to take a closer look.

A small part of the blood stains on the ground are regular and circular, obviously dripping vertically, and occasionally some of the aliens are not very deformed, was it a sneak attack? This part of the blood has dried up a little, and the two pools of blood next to it are relatively moister, and there are still some traces of being smeared. In addition, there are also a lot of blood stains on the roof handrails, and there are more or less signs of smearing, and the blood stains on the cement fence under the handrails are distributed in the shape of grapes.......

"How?" Ten minutes later, Chu Zihang stood next to him and also leaned down to observe.

"There are a lot of traces, but I can't find a clue for a while. Also," he took out a sealed plastic test tube from his arms, shook it, and handed it to Chu Zihang. "I've collected the blood samples."

"Hmm. I'll send it back to headquarters when I get back. Chu Zihang nodded and took the blood sample into his arms.

Suddenly, Li Su got up and stood behind Chu Zihang and bowed slightly. The iron ruler had been hidden in his waist, and the knife bag had returned to his back, and Chu Zihang had put on the thin-framed glasses that were in the way, staring into the distance with an expressionless face, and he was dignified.

A few seconds later, the rooftop door opened again, and the Prime Minister, whom they had seen before, stepped out of it, followed by a group of followers. Mr. Prime Minister obviously didn't figure out how this envoy came here so quickly, Chu Zihang had already spoken: "Mr. Prime Minister, for some personal reasons, we believe that the cause of death of this deceased is related to our intentions, and I hope you can let us check the monitoring for a period of time." ”

"There's no problem with that." He ordered two people to signal them to stay and stay on the scene, and named a young man to let him be in charge of directions, and he took out his mobile phone to make a call, which was obviously another big trouble.

The young man who showed them the way was very clever and eye-catching, and he didn't talk much along the way, and directly led the two into the monitoring room. The security guards in the surveillance room recognized him and followed his instructions. A few minutes later, the surrounding surveillance was filled with footage from a few minutes earlier.

"I'll do it myself." Chu Zihang pushed away the security guards who controlled the equipment, his hand flickered on the rows of knobs, and the picture began to flicker rapidly. On the other side, Li Su also occupied a console and began to look for the traces left by the murderer.

"Thirty minutes ago." Chu Zihang pointed to one of the screens, on which the deceased had just walked into the safe passage.

"Why a safe passage?" Li Su was a little puzzled. The twin towers of Oslo City Hall are not wooden towers, and the height of a building of dozens of floors is not a good choice for the average person.

"Probably...... Let's get to the top of the building. The young man who brought them in said suddenly. If you reach the work area by elevator, you need to swipe a special ID card, which is not accessible to tourists. There is no access control for the safe passage to facilitate escape, but we have put no entry signs around. ”

"Isn't there surveillance for safe passages?" Li Su asked again.

"No, the safe passage is generally not monitored."

Wow, Li Su is a little depressed. Why is there such a plot like a Grim Reaper schoolboy? Why is there just a lack of surveillance at key locations?

"Four people." Chu Zihang said suddenly.

"What four?" Li Su turned around.

"If the other party hadn't left by other means, the murderer could only be four people." Chu Zihang paused four scenes, and in each of them, someone walked into the safe passage.