Caroline asked, "Do you mean that the murderer came out of this manhole in the middle of the night, and it happened that this place was in a blind area blocked by branches and leaves, so he was not found to have entered this house?" ”

Wang Su nodded: "Yes, I speculated. I think this is the only way the killer can not be caught by the surveillance cameras. ”

Caroline pointed in the direction of the church: "According to you, there is also a connected manhole in the church?" ”

Wang Su glanced at the serious Caroline and smiled: "Wouldn't you know if you go to the church again?" ”

So the three of them returned to the church again, and after walking around the outside of the church, they found an identical cast iron manhole cover on the side of the road at the back entrance of the church.

The three of them stepped forward to take a look, only to see that the manhole cover read, "Municipal Flood Discharge Pipeline MPT-17 Maintenance Opening." ”

Caroline looked around the environment around the manhole cover, patted Wang Su's shoulder and said proudly: "Miscalculated, big detective, there is no big tree next to this manhole cover, anyone who goes down from here will be clearly photographed by the camera." ”

"Really? But my instincts have always been accurate. With that, Wang Su called Hannah again.

"Hey, Hannah, you've checked the surveillance video of the roads in the neighborhood back then, haven't you?"

Hannah on the phone replied, "Huh...... Didn't I say that we only checked the video recordings of the three days before and after the crime, and found nothing suspicious. ”

"Including near the church?"

"Yes."

Wang Su looked at the sky and thought for a while, and said, "Then please take a few pictures of the surveillance video of the back door of the church three days before and after the crime." ”

"No problem!"

Soon, Wang Su's mobile phone received a screenshot sent by Hannah again, and Caroline impatiently snatched the phone from Wang Su's hand.

But as soon as she clicked on the screenshot, Caroline was dumbfounded.

I saw that the part from the back door of the church to the middle of the road in the screenshot was all covered by tents!

This manhole cover is also being covered by tents!

In other words, when you walk out of the back door of the church to reach the manhole cover, you are in the tent the whole time, and you will not be caught by the camera at all!

"What the hell, why was there a tent here!!" Caroline shouted reluctantly.

"Hehe, you see, I told you I had a good intuition." Wang Su smiled and took back his mobile phone, "But... It's strange, why are there tents? ”

"I'll see." Kevin sent the screenshot out loud and found that the tent was printed with a LOGO and other words, "This is written... B&Q Decoration Engineering ......"

Wang Su frowned and stared at the screenshot, nodded and said, "It should be the company that undertook the interior decoration project of the church back then." ”

"I'll check the company's phone number and call and ask." As he spoke, Kevin took out his phone and walked aside.

About a quarter of an hour later, Kevin walked over.

"Clear. The renovation company is a relatively old company, and the construction steps are quite standardized, and the reason for setting up this tent at that time was to pile up harmful decoration materials and garbage and combustible gases that some tools need. According to their construction records, the tent was not dismantled until the construction was complete, six days after the incident. ”

Wang Su stared at the manhole cover and smiled, and said: "It seems that it is very likely that the murderer reached the back door of House No. 171 through the connected pipe, and returned to the church through the flood pipe after succeeding. ”

"Why don't you send someone to open the manhole cover and inspect the pipeline?" Carolyn asked.

"It's useless!" Unexpectedly, Wang Su waved his hand and paced around the manhole cover, "14 years have passed, I don't know how many times these flood pipes have been hit by the current, and I don't know how many times the dredging workers have gone down to clean them, even if there are any clues and evidence left at the beginning, there are no traces now." It can only be said that we have only found one speculation that can explain the whereabouts of the murderer, and what the real situation is, I am afraid that we have to let him say it himself after catching the murderer. ”

"Yes, it does." Kevin chimed in, "Caroline, Wang Su said this with a very strict attitude. Even if the murderer's method of movement has been shown before our eyes, in the absence of evidence or the murderer's own identification, no matter how convincing this speculation is, it is still speculation, not the truth. ”

"Yes, yes, yes... You're right, Big Brother Kevin! Wang Su stretched out his hand and rubbed Caroline's head, "Children, listen carefully, take a note!" ”

"Okay!!" Saying that, Caroline stomped on Wang Su's feet fiercely, "This kid must write it down!" ”

"Pain, pain, pain......" Wang Su bared his teeth and jumped on one leg, "God!! You... You girl is violent!! ”

"Make you proud!"

“……”

Two days later, in the morning, Wang Su received a call from Kevin and came to the Serious Crimes Division again.

The traces department found a small amount of dandruff in the hood of the black isolation gown and successfully extracted DNA, which was presumed to be the murderer's. The blood stains on the isolation gown were completely consistent with the DNA of the victim and his wife. This can directly prove that the murderer killed the victim and his wife while wearing this isolation suit.

But to Wang Su's greatest regret, no fingerprints were extracted from the dagger.

After all, if there is a fingerprint, then things are much easier, just enter it into the fingerprint library and compare, and soon you can get the information of the fingerprint owner.

And after several days and nights of struggle, Hannah's side finally locked on a suspicious figure.

The video shows a man in a white coat pulling a large suitcase into the community at around 2 a.m. eight days before the crime, and he has not been seen outside the community since.

It wasn't until 11 o'clock in the evening on the 16th day after the crime that the figure appeared in the image of walking out of the community, and from the relaxed state of walking, it was obvious that the large suitcase was empty.

In other words, this man is likely to be the murderer who has been dormant in that stuffy top layer for 25 days.

But it can only be said that it is very likely.

To Wang Su's regret, whether the man entered or walked out of the community, he was wearing a very low peaked cap and a wide mask on his face, so that the man's facial information could not be clearly obtained from the video, but it could be roughly seen from the walking pace that the man had obvious looped legs.

This means that the man cannot be located through facial recognition through the National Surveillance Network.

After a few days of busy work, it turned out that the two breakthroughs that Wang Su hoped to get the most - fingerprints and physiognomy characteristics were out of play, and it was undoubtedly a needle in a haystack to look for just this walking feature of Luo Quan's legs.

Although the suspect's DNA has been found now, who should I go to to compare this DNA? Based on the analysis of the information currently available, there is no direction to speculate on the suspect, but I can only roughly feel that he is a professional killer.

In the final analysis, although the case has indeed made significant progress, Wang Su and the others are still on the passive side.

"What now?" Hannah asked anxiously with a pair of panda eyes.

Wang Su smiled: "You should go and rest now." ”

Caroline also persuaded: "Hannah dear, you haven't closed your eyes much in a few days, hurry up and go to sleep for a while, let me force him!" ”

Saying that, Caroline turned her head and glared at Wang Su: "Yes, what should I do now!?" ”

Wang Su shrugged his shoulders: "The other party is a more professional killer, and it may be difficult to make progress if you stare at the murderer itself." Since we speculate that this is a case of hired homicide, we might as well start from the line of identity of the employer. ”

Caroline tilted her head and asked, "Employer??" Is that even more clueless? ”