Guan Feng said, "Once the technical department is done with their work, we'll come over and extract these footprints. We'll also check if there are any fingerprints left on the trolley. The rest is just waiting for people to come back for comparison."

Qi Xia asked in surprise, "Captain, do you mean... that person from this morning might be a suspect?"

Guan Feng nodded and whispered, "The footprints on the windowsill match his suspicious characteristics, but apart from Captain Kai, no one knows anything about this. Keep it to yourself and don't alert him."

Qi Xia immediately replied, "I understand!"

Guan Feng said, "You wait here, I'll go back and call Lao Yang over."

As he spoke, he walked back to the factory window he had just been at, looked at Lao Yang, and asked, "Lao Yang, how's it going on your end? Have you finished extracting it?"

Old Yang said, "That's about it. Have you found any more clues over there?"

Guan Feng nodded and reminded him, "We found the handcart and a similar footprint on it. I was thinking if you're done here, you could go over there. Besides the footprint, there might also be some fingerprints left on the handcart handle."

Old Yang said, "There really is! Okay, I'll go with you now." He turned to give an instruction to the two team members and followed Guan Feng over.

A moment later he came to the handcart, glanced at it and nodded, saying, "I'll see if I can get it."

Guan Feng nodded.

At this moment.

Guan Feng received a call from Liu Shengguo.

He traced the timeline of the surveillance footage to identify all individuals who appeared on the cameras.

Guan Feng said, "Wait for me in the monitoring room! I'll be right there."

After hanging up the phone, he said to Qi Xia, "Sheng Guo has some leads. Qi Xia, you stay here and help Captain Yang with his work. Let me know if you get any leads, I'll head over there first!" He then said to Lao Yang, "Lao Yang, thank you for your hard work!"

Old Yang waved his hand and said, "Captain Guan, you go ahead and get busy."

Qi Xia said, "Captain, I'll stay here! I'll report back to you if anything happens."

Guan Feng nodded and left.

They jogged all the way to the monitoring room, where Liu Shengguo and Huang Lili were freezing the surveillance images one by one.

Upon seeing Guan Feng walk in, Liu Shengguo immediately said, "Captain! Take a look. This is footage captured by all the factory's surveillance cameras early this morning. All the personnel have been photographed. Except for a few that are blurry, the others all have clear photos of their faces."

Guan Feng took Liu Shengguo's phone and began to examine it one by one.

There are 13 photos on my phone!

Ten of the photos were clear, showing the faces of the victims. Guan Feng was able to match them one by one with the ID photos in the files, confirming that they were all factory employees.

He frowned and said, "These 10 photos are the same as the ones I just saw in the HR department. We'll have someone identify the remaining three photos later. Are there any other suspicious points?"

Liu Shengguo turned on the surveillance footage again and pointed to one of the trucks, saying, "Captain, the timing of this truck's passage is strange."

Guan Feng looked at the large truck, but didn't notice anything unusual. He frowned and asked, "What you're saying isn't right?"

Liu Shengguo said, "These trucks were probably carrying coal ash from the furnace, which is what we commonly call slag. Other trucks took about two minutes to pass through these two monitoring points, but this truck took a full ten minutes! Given the road conditions at the time, this is not normal!"

Guan Feng immediately said, "Show me the footage."

Liu Shengguo then started playing the video.

The first surveillance camera starts at the warehouse where the dump truck dumps its waste. Once the vehicle leaves the warehouse, it disappears from the surveillance footage. It reappears on the last surveillance camera on the road. The whole process takes 10 minutes and 3 seconds.

It is indeed illogical to cross such a short distance in 10 minutes.

Liu Shengguo then retrieved the time records for each of the other vehicles.

The fastest car took less than a minute and a half.

Guan Feng frowned and said, "Isn't this the road outside the pressure tank room?"

Liu Shengguo said, "That's right! The pressure tank is here, there's an open lawn outside, and then there's the road. This car left from this road."

Guan Feng nodded and said, "The time is exactly around 5:20. No matter what, we can't overlook this suspicious point. Report the license plate number of this car to the traffic police and let them check the owner of the vehicle for the next investigation."

Liu Shengguo said, "Okay, I'll contact them right away."

Guan Feng patted Liu Shengguo on the shoulder and said, "Shengguo, well done!"

Liu Shengguo smiled somewhat naively and said, "It's all thanks to the captain's guidance!"

Guan Feng waved his hand and said, "What does this have to do with my training? Checking surveillance footage requires hard work and patience; most people don't have that kind of patience!"

"Now that the surveillance footage has been reviewed, Shengguo, go to the office building and meet up with Gao Dacheng. Go with him to ask questions, and pay close attention to everyone's expressions. Remember one thing! Talk less and observe more; it will be good for your micro-expression analysis!"

Liu Shengguo immediately said, "Thank you, Captain!"

Guan Feng urged, "Go quickly."

Huang Lili said, "Captain, I also want to improve."

Guan Feng laughed and said, "I won't hinder your progress! But it's almost noon, so go buy some lunch. Buy it together with the technical department, 15 set meals, like the Shaxian ham set meals, and ask the owner to deliver them!"

Huang Lili said, "Okay! I'll give them a call."

Guan Feng said, "Tell the boss to add a braised egg, a duck leg, and lots of side dishes. The price is negotiable."

Huang Lili said, "Okay! I'll talk to the boss."

He then dialed a phone number to relay Guan Feng's request.

The boss was naturally delighted with such a large order that came knocking on his door, especially since it was from the Municipal Public Security Bureau's Major Crimes Team, a force that small business owners would try to curry favor with. He immediately said, "I'll get it ready right away! I'll deliver it as soon as it's ready, is that alright with you?"

Huang Lili said, "Mr. Zhang, there's no need to be so polite. Just deliver it before lunchtime."

The boss quickly replied, "Okay, okay, I'll prepare it right away."

Hang up the phone.

Guan Feng said to Huang Lili, "Let's go to the office."

On the road.

Guan Feng asked, "Lily, do you know that Uncle Huang is being transferred?"

Huang Lili said, "I know! Captain, it's not that I intentionally wanted to hide it from you, it's just that my dad said it hasn't been decided yet, and he told me not to tell anyone to avoid trouble."

Guan Feng nodded and said, "I know! What I mean is, if Uncle Huang is transferred, the avoidance relationship for immediate family members will no longer exist. Do you want to stay in our Third Squadron, or transfer to another squadron?"

Huang Lili said, "Is that so? I'm afraid my dad won't agree."

Guan Feng laughed and said, "Actually, Uncle Huang cares about you a lot. He told me these things in private. Fatherly love is like a mountain. He didn't tell you because he was afraid of causing any extra impact."

Huang Lili exclaimed in surprise, "How could my dad...?"

Guan Feng patted Huang Lili on the shoulder and said, "Are you touched? When you get back tonight, give Uncle Huang a couple more pieces of food."

Huang Lili nodded emphatically: "Yes!"