Detective: I can see the criminal record

The purple flashlight flickered in the dim room. Cen Lian kept moving the flashlight, and Tang Hua carefully used a pen to outline the area where the fluorescent agent had stained the glass.

"It seems that there is no more here." Qi Yan observed from the side.

Tang Hua looked around and found no trace of fluorescent agent.

"After six years, the potion here has faded a bit seriously." Cen Lian stood in the distance and turned on the purple flashlight again at the area marked by Tang Hua. "It looks like three English letters."

"This is SOS." Qi Yan said with great certainty.

Just now, as a bystander, he had been observing the shape of the remaining fluorescent agent. When the last trace was confirmed, the shape he sketched in the notebook became clear.

"I'm going to find fluorescent agent and try it on the window next to me," Tang Hua said and left. "I feel that if this SOS is in the dark, it should be visible from downstairs."

Cen Lian watched him go out to get something.

"If traces of the fluorescent agent can really be seen outside, then it can be explained that Sun Xiaoyu suddenly came to the inpatient department on the third floor." Qi Yan closed the notebook, "It's just how the murderer ensured that only Sun Xiaoyu could see the 'SOS' call for help" Where’s the signal?”

Cen Lian is actually thinking about this issue as well.

He stood in front of the window and suddenly discovered that there was only an old-looking building behind the inpatient building, and it was not close to any streets or outpatient buildings.

"Director He, where is the place behind our building?" Wang Yuanteng received Cen Lian's look for help and immediately asked about this middle-aged bald cadre named He.

Director He glanced at the direction Cen Lian was facing and said without thinking: "There is a dormitory building at the back. Our hospital's trainees and doctors who come for further training can live in it if they don't want to rent a house."

"Did Sun Xiaoyu live in the dormitory building back then?" Cen Lian had already walked over.

Director He recalled it and nodded quickly.

"I remember that among the girls in her class who came directly for training without going to graduate school, she was the only one whose home was far away, so she lived in the dormitory."

"Can the dormitory building go directly to the inpatient building?" Cen Lian continued to ask.

Director He pointed downstairs, "There is a small door on the first floor, which is an easy way for them."

Cen Lian recalled the time of the crime in the file and looked back at Qi Yan.

Qi Yan also came over.

"The crime occurred after ten o'clock in the evening. According to the schedule at that time, Sun Xiaoyu should have planned to take a shortcut from the inpatient building to the outpatient building after coming out of the dormitory building." He gestured at the distance, "This ward was originally The damage may not be accidental.”

Cen Lian had already basically reconstructed the method of committing the crime in his mind. After Tang Hua came back from fetching his things, it would be easy to verify whether he could see the distress signal when walking from the dormitory building to the inpatient building late at night.

But the most important question at this moment is not the murderer's modus operandi, but how to find clear evidence pointing to Lin Xiangyuan.

…

Tang Hua quickly rushed over with a technician and several reagents obtained from the criminal police team's laboratory that only developed under ultraviolet light.

The technician used a purple light to study in front of the window for a while, and quickly took out a tube of medicine.

"He used this 'invisible ink'," the technician took out a brush and quickly smeared the SOS symbol on another piece of glass without any traces, indicating that they could go down and observe.

Cen Lian and Tang Hua came downstairs together and stood on the only way from the dormitory building to the inpatient department.

"Let's start." He called Qi Yan remotely.

In the ward on the third floor, the technicians retreated. Qi Yan held a purple flashlight in his hand and accurately shined the light on the glass.

"Can you see it?" Wang Yuanteng asked on the intercom

"Okay, I'll take a picture for you to see." Cen Lian held up his cell phone and clearly took a picture of the writing on the glass window.

They went out and came to the hospital in the afternoon. Although it was not yet half past ten, it was already quite dark and they could basically simulate the environment on the day Sun Xiaoyu was killed.

On the glass window on the third floor of the inpatient department, a line of SOS is clearly visible under the illumination of a purple light.

"It's really a well-planned plan." Tang Hua looked up at the wards on the third floor of the inpatient department. "He should have specially designed it. When he walked from the dormitory building to the downstairs of the inpatient department, these were the only wards that Sun Xiaoyu could see."

Cen Lian realized something was wrong, "This ward shouldn't suddenly have problems and need repairs."

There are so many coincidences in this world, how could it be that just when Lin Xiangyuan needed to kill someone, the ward that was most suitable for leading people upstairs to check happened to have a problem and needed repairs.

"Check which patients have stayed in this ward before," he said to Wang Yuanteng on the intercom as he went upstairs: "I suspect that this ward was vandalized."

Wang Yuanteng looked at the dormitory building with a remote angle, and also felt that this ward was strange.

Director He of the Medical Department has already noticed some clues from their conversation. The quality he has developed in the office for nearly twenty years tells him that when it comes to homicide cases, it is best for the police to investigate whatever they want.

"We have the hospitalization records here. I will take you to see them now." Director He became a little more proactive at this time.

When Cen Lian went upstairs, he saw Director He taking Wang Yuanteng to retrieve hospitalization records.

"This is the photo we took downstairs." After greeting Director He, Cen Lian showed the SOS he had just taken to the two of them. "As long as the murderer can grasp the time when Sun Xiaoyu leaves the dormitory building to go to work, it is very easy to let her see the distress signal alone."

Wang Yuanteng could clearly feel that the case was gradually becoming clearer as it was constantly unraveling.

"Let's go and check the hospitalization records." Wang Yuanteng took Cen Lian away.

Tang Hua looked at Qi Yan and the technician who were guarding the ward, and after thinking about it, he decided to go to the ward with them.

Cen Lian and Wang Yuanteng went to check the admission records together.

"The last patients admitted to this ward before the failure were these three." Director He retrieved the hospitalization records before April 17 six years ago from the hospitalization system, and quickly found the admission records of Ward 327 on the third floor.

"When the police came to investigate, they specifically looked at the surveillance. They seemed to suspect that someone had deliberately destroyed the oxygen system we buried in the wall, but no one who did not belong to this ward was filmed entering a few days before the incident." Director He explained to them while finding the patient information.

"Please give us one of these three patient information," Cen Lian thought for a while, and then expanded the scope to all wards with clear glass on the way from the dormitory building to the inpatient department. "If the murderer wanted to intercept his marriage examination report, then given his urgency at the time, it is impossible for him to only focus on this ward."

Director He handed the patient's admission record to Wang Yuanteng in person with a rare well-behaved attitude of a middle-aged man.