At this moment, in the victim's courtyard, Jiang An, Zhang Yean, and Wan were busily engaged in their tasks.

The three of them formed a line and gradually advanced.

They didn't just search the visible areas, they also left no stone unturned under the covered objects.

After 20 minutes, the three of them arrived at the entrance of the living room.

Wan straightened his back and sighed, "Oh, my old back!"

Zhang Yean's lips curved into a smile, and she said, "Senior brother, you're so young and your back is already worn out?"

Wan pouted, "Senior brother is no longer young, you two are the young ones."

Jiang An stood at the entrance, looking solemn.

His gaze swept over all the items in the room as he pondered.

If the killer returned to look for something, where could it have fallen?

Jiang An narrowed his eyes slightly, envisioning the entire crime process in his mind.

The perpetrator entered the room, first interacting with the male victim, and subdued him in the living room.

Next, the killer entered the bedroom and encountered the female victim.

Moreover, the killer completed the robbery of money in the bedroom.

At this moment, the three stages unfolded in Jiang An's mind.

If the killer's intention was to find something, that item must have been carried personally.

And thus, it could only have fallen within his movement range.

Thinking of this, Jiang An slightly opened his eyes.

Seeing the chaotic array of items before him, his thoughts slowly took shape.

Just then, Zhang Yean stepped forward and suddenly said, "Junior brother, there seems to be a lot of stuff in this area."

"If we have to search through every single item, it might take quite a while."

Jiang An turned his head and said, "We don't need to search everything."

"We just need to focus on areas where the killer moved."

"If the item fell, it should be in the places he moved through."

Wan turned to look and smiled wryly.

"Junior brother, even though it's just three tiled rooms,"

"the fight between the killer and the victims happened all over the place. It's not an easy task either."

Jiang An nodded.

"Based on this, I think we've already narrowed down the room's area significantly."

Wan shrugged, "You're right, the area has indeed been greatly reduced."

"But, even so, the remaining area is still quite large."

Zhang Yean patted Wan's shoulder with her hand.

"Let's get started, senior brother, or we'll be stuck here till dark."

Then, the three quickly moved into action.

Starting from the living room entrance, they continued to advance.

Guided by Jiang An, the three gradually expanded their search area.

Meanwhile.

Mr. Zhao led a team and arrived at the Northern Communications Shop.

At the shop counter, Mr. Zhao showed his credentials.

"Hello, we're officers from the Jiangcheng Criminal Investigation Team, investigating a case, please cooperate."

The woman at the counter saw the police credentials, and her face suddenly showed a trace of tension.

She subconsciously stepped back two paces and waved her hand, "I haven't broken any laws."

Mr. Zhao smiled, "There's no need to be nervous. I know you haven't broken any laws."

"Today, we're here to investigate a purchase of a phone made here."

As he spoke, an accompanying officer lifted the handbag.

"Is this handbag used by your shop?"

The service staff glanced at it and nodded, "Yes, it is!"

Mr. Zhao then asked, "Where is your manager?"

"Mr. Liu is on the 2nd floor."

Mr. Zhao nodded, "Thank you!"

Then, the four of them turned and took an escalator to the 2nd floor.

In the 2nd floor manager's office, Mr. Zhao explained their purpose and presented Wang Chuang's photo.

"Mr. Liu, we want to check your store's surveillance."

"To see if this young man purchased a phone here."

Mr. Liu nodded and said, "No problem, cooperation between police and civilians is a noble tradition, we absolutely support it."

"Our store's monitoring room is next door, I'll take you there."

During their walk, Mr. Zhao suddenly recalled that the incident occurred about a month and a half ago.

The time when Wang Chuang bought the phone after obtaining the money was also uncertain.

Immediately, he turned and said, "Mr. Liu, could you check the sales records of this phone model in your store?"

"No problem, I'll arrange for it right away."

5 minutes later, Mr. Liu came over.

"According to our internal sales system, this phone was purchased on the 14th of this month."

"The 14th?"

"Only this one phone was sold?"

Mr. Liu nodded, "This model is an elderly phone, it's rarely bought."

"I checked the sales records for the past two months, and only on the 14th of this month was there a purchase."

"Since the payment was made in cash, further inquiries are not possible."

"Thank you. Could you specify the time at the register?"

Mr. Liu recalled and said, "From earlier, I remember it was around 3:30 in the afternoon on the 14th."

"Thank you!"

Subsequently, the accompanying officer opened the surveillance system and adjusted the search to the specified time.

They found the surveillance footage from the afternoon of the 14th.

The officer seated in front of the monitor turned and asked, "Mr. Zhao, there're many cameras in the mall, where should we start?"

Mr. Zhao lowered his head in thought.

"Just now Mr. Liu mentioned the payment was around 3:30."

"We don't know how long he roamed the mall, so checking the entrance cameras isn't efficient."

"Start by checking for any near the cashier?"

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