It was already drizzling outside the window, and the raindrops were crackling on the windows of the conference room, splashing a cloud of mist and dispersing, distorting the envelope photos on the interior curtain.

The front of the envelope is a one-yuan sky stamp, the postal code is blank, and the upper left side is the mailing address: Criminal Investigation Detachment of the Public Security Bureau, No. 188, Changjiang Road, A, and in the middle is seven square imitation Song printing font: Chen Jianbin Detachment Leader (receiving).

"Density spectroscopy analysis of the font printed on the envelope shows that the font on the letter paper is on the same printer."

Xia Dong continued to flip the back of the projection is the back of the envelope: "The model of the envelope is the DL envelope, that is, the No. 5 envelope, which was printed by SJ City Hope Paper Products Factory in July 3018, with a print and demand of 200,000, and a large number of circulation in our city. ”

"The stamps are standard stamps issued in 3019, and the amount of use is also very extensive, and the stamps are attached to the solid glue sticks, and we have analyzed the colloidal composition of the glue sticks, and the comparison is determined to be DL brand office glue sticks."

Chen Jianbin 's cold and frosty expression eased slightly, and he nodded slightly, the criminal police members who were familiar with the detachment leader knew that this meant that the report had passed, Xia Dong secretly breathed a sigh of relief, turned around and sat back in his place.

"The work of the technical room is good, and the details are in place."

After the words fell, Chen Jianbin looked at Wang Tao on the right side: "Wang Tao, you are in charge of the investigation, what are the results of the investigation on your side?" ”

Wang Tao has dark skin, short black hair, and is half a head shorter than Chen Jianbin when he sits next to him, and his face is as dignified as a lead cloud outside the window: "Team Chen, we have tracked the origin of this letter in the past few days. ”

Different from Xia Dong's gentle and sweet voice, Wang Tao's voice is very loud and loud, he took the PPT remote control pen handed over by Xia Dong and clicked the PPT, and a photo of the mailbox was presented on the projection screen: "We found the mailing address of the letter through the postmark on the envelope, the Huanghe Road Postal Delivery Station." ”

Wang Tao continued to click on the PPT page to turn the page is a magnified picture of the postmark: "The Huanghe Road Postal Delivery Station cleans up the letters in the mailbox before 4 o'clock in the afternoon every day, and then stamps and delivers the mail the next day, and the receipt time on the postmark is August 28, which means that the other party put the letter into the mailbox on August 27. ”

"There are two surveillance cameras near the entrance of the postal delivery station on Huanghe Road that can shoot the mailbox, one is the self-owned monitoring at the door of the delivery station is facing the gate and the mailbox of the delivery station, and the other is the traffic violation monitoring 50 meters away from the west side of the street road of the delivery station."

Wang Tao's voice was low, and Chen Jianbin and Xia Dong's attention was on the photo of the projection screen: "By extracting the surveillance records of the day, we found the person who delivered this letter!" ”

Chen Jianbin moved his eyes, his body leaned forward unconsciously, Xia Dong didn't expect Wang Tao to find the person who delivered the letter so quickly.

The projection flips and the screen shows a teenage boy, who can be seen tiptoeing into the mailbox with a letter on tiptoe.

Is it a child?

Xia Dong covered his mouth, his eyes full of disbelief: "Wang Tao...... Are you mistaken, how can you be a child? ”

Chen Jianbin also looked at Wang Tao with puzzled eyes, a threatening letter mailed to the Criminal Investigation Detachment of the Public Security Bureau, how could the delivery person be a child?

That's right, the reason why Chen Jianbin is so cautious about an anonymous letter is because it is a threatening letter.

Intimidation of the Criminal Investigation Detachment of the Public Security Bureau...... It's a wonder in the world.

Chen Jianbin saw this letter's first reaction was that it was fake and a prank, but Chen Jianbin still paid enough attention to this letter after wandering on the edge of crime all year round and dealing with all kinds of vicious criminals.

On the one hand, the content of the letter is too horrified, and on the other hand, who ate the bear's heart and leopard gall and dared to write a threatening letter to the criminal investigation detachment?

Wang Tao smiled bitterly and shook his head: "My first judgment is whether we are wrong, but after repeated confirmation, we finally determined that it was this teenage boy who delivered the letter, but the real delivery person of the letter was not this boy." ”

Chen Jianbin frowned even tighter, his temples pulled up a few wrinkles, and his eyebrows were twisted into Sichuan characters, but he did not raise any objections, obviously waiting for Wang Tao's next words.

"Since the pick-up time at the Huanghe Road Postal Delivery Station is 4 p.m. every day, we retrieved the surveillance video data from 4 p.m. on August 26 until 4 p.m. on August 27, and a total of six people, including this child, delivered the letters during this time, and these six letters were stamped and delivered the next day, August 28."

"We have traced the other five letters, and according to the sender's address on the envelope, we have found the five people who delivered the letters, and ruled out the suspicion of five people."

The projection switched, and it was the other five letters: "We have also found this little boy who delivered the letter, he is the child of the owner of a nearby restaurant, he is in the fourth grade at the 12th elementary school opposite the delivery station, and on the way home from school at noon that day, the child met a man on crutches, and it was this man who asked the child to help deliver the letter." ”

A man on crutches?

Chen Jianbin was in high spirits again, and the man was on crutches, which was an obvious feature, but it was impossible to judge whether the other party was deliberately disguised for the time being: "Does the child remember what the other party looks like, such as whether he has special facial features, how tall he is, and what clothes he wears?" ”

"And where did this man give this letter to the child?"

Chen Jianbin decisively grasped the crux of the problem, a child in the fourth grade of primary school is ten or eleven years old, this age is unlikely to describe the other party's appearance clearly, but there should be an impression of some obvious characteristics.

"Team Chen, we have asked about the relevant questions, the child said that the other party was wearing a mask and did not see the other party's face clearly, he saw that the other party was on crutches, and it was the disabled person who helped deliver the letter, the gray jacket that the man wore that day, the height was about the same as the child's father, I have seen the child's father, the height is about 1.7 meters, and the place where the other party handed over the letter to the child is on the side parallel to the traffic surveillance camera, in front of a noodle restaurant."

Chen Jianbin keenly grasped the key point in Wang Tao's report: "You mean that the surveillance camera just didn't shoot the other party?" ”

Wang Tao nodded immediately, flipped the projection, and it was a street photo, marked with four red dots: "This is the street view photo we took from the top of the three-story building across the street, the first red dot is the location of the post box, the second red dot is the location of the camera at the door of the delivery station, the third red dot is the location of the traffic surveillance camera, and the fourth red dot is the location of the letter handed over to the boy by the man on crutches." ”

The photo is very clear, and the four red dots seem to be connected into a poisonous snake spitting letters, which is suddenly presented in front of Chen Jianbin at once.

Staring at the four scarlet markers on the projection screen, Chen Jianbin returned to three days ago.