00:00This woman only went to the police station to clean,
00:02yet she spotted a mistake in the investigation.
00:04At a glance, she threw away her lollipop,
00:06her mind racing as she instantly realized
00:09the police had mistaken the victim for the killer.
00:11If there's a mistake, it must be corrected.
00:13She crossed out the suspect label and wrote victim underneath.
00:16She thought it was a simple gesture,
00:18but the next day, David, who led the case, was furious.
00:21After questioning everyone with no result,
00:23he checked the surveillance footage from the night before.
00:25Lucy's dancing steps were all recorded.
00:27The female supervisor warned her that interfering with criminal cases
00:30could lead to jail time.
00:32Lucy looked innocent, saying she was only correcting a mistake.
00:35David was angry.
00:36He had been a police officer for decades
00:38and didn't need a cleaner telling him how to run a case.
00:40The supervisor ignored him and instead took out the files,
00:43asking Lucy to explain.
00:45Lucy said every piece of furniture in the house was arranged neatly
00:48and the entire house and hall were spotless.
00:51This suggested the homeowner was very tidy.
00:53But strangely, the curtains nearby were all tied neatly with ropes.
00:57Except the one on the far right, which was missing a rope.
01:00Lucy deduced the killer must have used it elsewhere.
01:03There were traces of bindings on the chair.
01:05Someone had clearly used tape there and later torn it off, leaving marks.
01:09This meant someone had been tied to the chair,
01:11but the victim's arms had no binding marks.
01:13From these details, there was clearly a third person at the scene,
01:17and the homeowner was also a victim.
01:19Her reasoning was flawless.
01:20Even the experience David couldn't refute it.
01:22He said they needed to check nearby surveillance
01:24to truly confirm the third person.
01:26But before he finished speaking, a subordinate brought new information.
01:29Cameras showed a woman entering the victim's house.
01:32The third person had appeared.
01:33However, Lucy had still broken the rules, so David ordered her detained.
01:37Even so, he had to admit her reasoning was correct.
01:39They had to overturn the case and start again to find the other victim quickly.
01:43Soon, they discovered in nearby surveillance
01:45that an Asian girl had visited the scene that day.
01:47Although she repeatedly denied it, she had no alibi.
01:50Just as David's team was about to name her the prime suspect,
01:53Lucy, about to sign a confidentiality agreement,
01:56glanced at the footage and realized it wasn't from the day of the crime.
01:59David grew irritated seeing her again.
02:01They had finally made progress, but the supervisor wanted Lucy to explain.
02:04Lucy said the wind in the video came from the southeast,
02:07but in that season, the city should have northwestern winds,
02:10so the footage must have been from months earlier.
02:12Determining the wind direction was simple.
02:14There was a church behind the girl.
02:15Historically, churches were built facing east,
02:18so sunlight would appear behind the priests.
02:20By observing the leaves in the footage,
02:22the wind direction could be determined.
02:24As for what wind blew on the day of the crime,
02:26everyone should know that.
02:28The officers looked at each other, unsure if they were being mocked.
02:31Lucy didn't care.
02:32She turned to leave immediately.
02:33However, the female supervisor suddenly called her back.
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