April 6, 2018, 12:00 p.m. sharp.

"So the puzzle of the selection competition has anything to do with the code puzzle solving..."Li Xiaonan thought while eating "a certain state ramen" at a noodle restaurant: "The pre-selection puzzle used the interval of the willow tree as the Morse cipher, and got the clue of Caesar's encryption. Then through the visual difference, I got the letter hint of AZQ from the corridor, and used Caesar encryption to pan forward a letter, and just got the answer 'ba

’。 ”

"Then through the last text message - 'Please go now'. At that time, the time limit was only 10 minutes, so the so-called 'registration office' must have been located within 10 minutes of walking from the entrance of the stadium. An adult male walks about 700 to 1,200 meters in 10 minutes. ”

"I'll go back to school and pick up those books on code puzzles with you." Li Xiaonan patted the backpack on his back and arranged follow-up actions for himself.

“...”

13:00 sharp. A "certain gram" coffee shop in the center of Dia city.

Li Xiaonan sat in a corner position, and entered "Sword of the Last Light" on the login interface of his mobile phone with some nervousness.

"May the truth be the driving force for you to move forward, may the 'result' not be an excuse to stop you from pursuing the truth, and may the light of truth illuminate you who are willing to chase it."

"Detective 'Sword of the Last Light', congratulations on your successful selection for the selection competition, click 'Flip Through' to get an overview of the case for this exam question. Before that, there are a few points to be declared here - the cases of this selection competition are all real cases that occurred in the region, or are centered in the region, and the organizers do not know the truth of the case, so the end of the competition depends on whether there is a detective who can submit a complete logical chain to prove the reasoning, or whether the prisoner is captured and has a complete chain of evidence to prove that the criminal is the mastermind of the case. Secondly, the information or case files that can be consulted on this website using keywords are all police information or detective notes that have been handled before, at least in the subjective consciousness of the recorder, and the content is all true and credible. If there is a situation where the keyword cannot be found, it means that the keyword has not been recorded by anyone before. ”

"Is the detective's selection contest so big..."Li Xiaonan said to himself in some surprise: "It's actually a real case as the exam question, and... The real murderer is still in a state of 'fugitive'..."

Li Xiaonan did not immediately check the information of the exam questions, but took out a thick notebook from his backpack and put it on the long table in front of him, ready to take notes.

As a marker pen turned in a circle in his hand, he clicked the "flip" button on his phone's screen.

"Stage B Detective Tryout Case Overview - A series of cases that lasted for eight years took place in Dia City, and the suspect would dismember the victim and dump the body in various corners of Dia City every time he committed an attack. Since 2010, the suspect has received a report of suspected human bones every year, and it will be proven later that he is indeed a human skeleton. The informant is not the only one, and after a detailed investigation, there is no suspicion of committing any crime. ”

"There was no muscle tissue and internal organs on the human bones found, and the human bones were all steamed and defatted, and the suspect's techniques were professional, only the left rib left traces of the murderer's knife, and there were no traces of multiple chopping at the joints of the corpse."

"In addition to this, three fingers were missing from each body, and it is suspected that the suspect had some kind of habit of 'collecting.'"

"Detectives can visit this website at any time and use keywords to supplement the details of the case."

"In addition, the suspect is currently on the run, please protect your own safety, and if necessary, please do not be stingy with the help of the Dia City police."

After reading the question, Li Xiaonan immediately put back the notebook and marker he had prepared, then exited the website, got up from his seat as fast as he could, and left the coffee shop silently and quickly.

“...”

Thirty minutes later, inside a cheap budget hotel in the center of Dia city.

Li Xiaonan threw the backpack on the single bed in the room, held the room card and breathed a long sigh of relief: "I didn't expect to add another extra expense, if only the selection competition would provide a bonus." ”

After he carefully inspected the room to make sure that there would be no surveillance interested in a man who lived alone, he took out his notebook again, sat down in a chair, and entered the site.

"The 2010 mutilation case." Li Xiaonan typed in the keyword.

According to his analysis, usually the first case of a serial case is the easiest stage to grasp the criminal psychology of the serial killer and find the logic of the crime, because no one can be sure whether the serial killer has the possibility of "growing" in the later cases.

"In May 2010, a female cleaner in the downtown theater of Dia City was cleaning the stage after a musical performance, and found a complete human arm skeleton in a dimly lit corner, and immediately called the police. When the police arrived, they cordoned off the theater, but to no avail, as all non-theater employees, including the performers, had left after the performance. And because it was a charity performance, there was no registration of the audience on the day or the preservation of real-name tickets. ”

"The first human bone found was a right arm, which was artificially severed from the joint of the right shoulder blade, and the human bone had no flesh and blood attached to it, and it was steamed, so it is impossible to determine the time of death. While the DNA extracted from human bones was entered into a database for comparison, the police conducted a large-scale screening from the inside to the outside with the theater as the center, looking for the rest of the human tissue, as well as clues about the body dumpers. ”

"20 hours after the incident, by tracing the traces of the person who threw the body, the second human skeleton was found in the garbage transfer station located on the negative floor of a shopping mall near the theater, it was a complete right leg bone, and after DNA comparison with the right arm, it was confirmed that it was the same deceased, and combined with the length of the two human bones, it was inferred that the victim was an adult male with a height of 180cm to 185cm, aged around 20 years old."

"Twenty-five hours after the incident, the third and fourth human bones were found in a garbage dump outside two different communities on the edge of the city center. The human bones found were the left leg bone and the complete torso skeleton. After analyzing the torso skeleton, the victim's fatal wound was obtained, which was a sharp double-edged short knife with a length of 25 cm to 30 cm, which the suspect used to insert a knife into the victim's left rib cage and stab him in the heart. ”

"30 hours after the incident, there was no result in the DNA comparison in the database, but after comparing the blood samples from various hospitals in Dia City, the identity of the deceased was locked - Qiu Heng, male, 20 years old, 183cm tall, well-known music conductor, disappeared after a performance a month ago, and the informant was his agent, Han. Qiu Heng underwent a physical examination in Diya City in February of the same year, and left a blood sample, so he was able to compare successfully. ”

"After locking up the victim's information, the police began to investigate the victim's interpersonal relationship on the one hand, and continued to search for the rest of the human tissues on the other."

"Forty-eight hours after the incident, the police found the deceased's head in a sewage drain in a ruined temple in the northern suburbs of Dia City, which had also been steamed, and only had a skeleton of the head, without any hair remaining."

"Fifty hours after the incident, the victim's left arm was found in the wasteland further north of the broken temple in the northern suburbs, and he was buried under a tree. The difference is that the skeleton of the left arm is incomplete, and three phalanges are missing, namely the thumb, index finger, and middle finger. ”

"Seventy-two hours after the incident, no traces of the victim's flesh and blood tissues and internal organs were found, and it was suspected that the case was related to human tissue trafficking, and a city-wide search and investigation was organized."

"From the interpersonal relationship survey, Qiu Heng is humble and kind, never has a bad relationship with others, or has an enemy, and the social network is extremely simple, and is described as a 'clear stream conductor'. At the age of 18, he studied at the prestigious Conservatory of Music in Poland, during which time he first showed his musical talent, and at the age of 19, he rose to prominence as a 'genius conductor' in the industry, and began touring around the surrounding cities between 2009 and 2010 until his disappearance after performing at the Dia City Center Theater in April 2010. ”

"The conductor's fingers..."Li Xiaonan subconsciously said to himself: "People don't crave things they haven't seen." ”

The victim was a male between 20 and 30 years old, and there was no residue of flesh and blood, internal organs, or hair on the bones.

From 2011 to 2014, the victims' occupations were pianists, music teachers, surgeons and painters, and after 2014, the police stopped investigating the case for some reason, and began to intervene in the investigation by detectives in the name of commission, and as a result, from 2015 to 2017, the three detectives involved in the investigation all died at the hands of the suspects.

All the victims suffered the same fatal injuries, and after comparing the marks left on the ribs, it was found that the murder weapon used by the suspect was also the same as in the first case.

"So this is actually a 'cross-time and space' investigation of a suspicious case?" Li Xiaonan took out a crumpled cigarette from his pocket and put it in his mouth, thinking, "Let's go to that agent first and check the audience list when Qiu Heng performed for the last time." ”

"But then again, who has the power to stop the police from investigating such a bad thing... Serial Cases..."

"And... Suspiciously... How did the organizers seem to know that the suspect must have not left in Dia City? ”

After extinguishing the cigarette butt, Li Xiaonan shook his head slightly, took out a peaked cap from his backpack, and walked out of the room.