“Lin Su is very clever. He just described the thief’s motive and identity very clearly. He thinks that this explanation will clear him of suspicion.” Wang Shen said as he walked towards the entrance of the residential area.

"Captain Wang, the car is here. Where are you going?" Liang Zichen pointed to the car parked on the side of the road as he saw the direction Wang Shen was heading.

Wang Shen ignored Liang Zichen's words and continued walking towards the door. Liang Zichen caught up with Wang Shen and repeated his question.

"You think today's work is over? Today's work has only just begun." Wang Shen paused and looked at Liang Zichen.

Although Liang Zichen didn't know what Wang Shen was planning to do, he could only sigh heavily and follow closely behind Wang Shen.

Before Wang Shen even reached the entrance, he encountered a security guard on the road. Wang Shen stopped one of the guards, took out his police ID from his pocket, and said, "Are there any leaders in your community right now? Please take me to see him."

The security guard looked at Wang Shen with a start, then shone his flashlight on the police ID in Wang Shen's hand. After carefully examining the ID, the guard nodded and said, "Our manager Zhou is on duty today. He's in the duty room now."

Wang Shen nodded and said, "Please take me there."

Liang Zichen finally understood Wang Shen's motive. Lin Su had just said that he went out for barbecue with friends before returning to Xu Xiaolin's house, so he could use the community's surveillance cameras to verify Lin Su's words.

They hadn't walked far when the security guard led Wang Shen and Liang Zichen to Manager Zhou of the residential complex. After listening to the guard's explanation, Manager Zhou stood up from his desk, walked over to Wang Shen, and shook his hand. "Officer, hello, how can I help you?"

"Hello, because of the needs of the case, I would like to ask for your help to check the community's surveillance footage with us. However, we hope that you and this security guard will keep this confidential. After all, this involves your community, and it wouldn't be good for your community's reputation if it got out." Wang Shen clearly stated his purpose in one breath, and also made it clear to them to prevent them from gossiping.

Fortunately, Manager Zhou was a very sensible person. After listening to Wang Shen's words, Manager Zhou nodded repeatedly and said, "I understand, I understand. I won't ask anything or say anything. This way, please." After saying that, Manager Zhou led Wang Shen and Liang Zichen to the monitoring room.

"Which building's surveillance footage is the officer looking at?" Manager Zhou asked Wang Shen, standing in front of the monitor.

Wang Shen didn't know which building Xu Xiaolin lived in, so he described its location to Manager Zhou. As soon as Wang Shen finished speaking, Manager Zhou understood. Manager Zhou said to the operator, "Retrieve the surveillance footage from Unit 9."

"By the way," Manager Zhou turned to Wang Shen again and asked, "Which time slot would you like to see?"

After thinking for a moment, Wang Shen asked, "Does your building have surveillance cameras on every floor?"

"Yes," Manager Zhou replied.

Hearing what Manager Zhou said, Wang Shen smiled and nodded, saying, "That makes things much easier. Just help me access the surveillance footage from the 15th floor, from early yesterday morning until now."

After listening to Wang Shen's request, Manager Zhou nodded. The operator had also heard Wang Shen's words and then directly adjusted the screen to the surveillance footage from the 15th floor of Unit 9.

Because there weren't many people moving around on the same floor, Wang Shen requested that the video speed be adjusted to the fastest possible setting. From midnight until 7:00 AM, no one moved around on the 15th floor. Then, at 7:40 AM, Xu Xiaolin appeared in the surveillance footage. The footage showed that Xu Xiaolin seemed to be in a bit of a hurry when she left.

But just as Xu Xiaolin was about to leave, Lin Su suddenly poked his head out of the house. Seeing this, Liang Zichen quietly leaned close to Wang Shen's ear and said, "Lin Su is very clever; he stayed at Xu Xiaolin's house the next day."

Wang Shen nodded but didn't respond. The footage continued playing, and about an hour later, Lin Su also left Xu Xiaolin's house. The footage continued to play rapidly until 12:05 AM, when Lin Su reappeared on the surveillance camera. Twenty minutes later, Wang Shen and Liang Zichen brought Xu Xiaolin back.

The video suddenly stopped, and Manager Zhou looked at Wang Shen and said, "This is all the surveillance footage from yesterday until now."

"Manager Zhou, thank you for your help." Wang Shen smiled and shook hands with Manager Zhou. After expressing his gratitude again, Wang Shen and Liang Zichen drove away from Xu Xiaolin's residential area.

“Yesterday, Xu Xiaolin left her key at home. During her conversation with Lin Su, Xu Xiaolin inadvertently revealed that she was going to the old house to retrieve our diary. However, Lin Su didn't know where the diary was hidden in the old house. Yesterday was his last chance. Lin Su saw the key Xu Xiaolin had left on the table, so after dark, he sneaked into the old house, intending to steal the diary. Unfortunately, he was unlucky; he found the diary, but before he could leave the house, we discovered him.” Wang Shen analyzed Lin Su's entire crime as he drove, having identified him as a suspect.

“That analysis is reasonable, but we still need reliable evidence; we can’t just rely on our guesses,” Liang Zichen nodded after hearing Wang Shen’s analysis.

Wang Shen nodded. "So, let's investigate one more thing now."

"Are you talking about that barbecue restaurant?" Lian Liangzichen asked, looking at Wang Shen.

"According to Xu Xiaolin, Lin Su went to a barbecue restaurant today. And Lin Su himself admitted it. We already know the location of that barbecue restaurant, so let's go check it out now." In just a short while, the car had already stopped in front of the barbecue restaurant.

"Are you hungry?" Wang Shen picked a seat and sat down.

"Huh?" Liang Zichen was a little at a loss when faced with Wang Shen's question. However, after a while, Liang Zichen replied with a smile, "It's quite late. Although eating skewers is unhealthy, I can't refuse if Captain Wang wants to treat me."

After speaking, Liang Zichen sat down first, picked up the menu, and waved it at the owner. Wang Shen shook his head, sat down as well, and ordered a bunch of grilled skewers.

Although the weather wasn't as hot as before, enjoying barbecue and beer was still quite pleasant. After eating for a while, a thick layer of bamboo skewers lay on the table. Wang Shen glanced at Liang Zichen and asked, "Are you full?"

Liang Zichen finished his half-glass of beer, wiped his mouth with a tissue, and said, "I'm full."

"Okay, let's get back to work." With that, Wang Shen stood up from his chair.