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Many people think serial killers are pure lunatics or some sort of inhuman villain.

But this statement is inaccurate, and serial killers do not print the words serial killers on their faces, and future generations of research have shown that there is no shortage of highly educated, moral idealists in this group who are even willing to emerge for the truth they seek.

They look handsome, dress well, talk elegantly, and some of them have stable jobs and relationships for a variety of reasons why they end up as serial killers.

The FBI defines serial killers as the murder of at least three people and the existence of a "cooling period” during the operation, distinguished from a mass killer who carried out a massacre in the same location for a short period of time or a madman who succeeded in committing murder everywhere.

And Jack the Ripper is just a textbook serial killer.

His location was fixed around the White Church, with a consistent pattern of behaviour, which, according to Lestrade, occurred in three cases within half a month, 10 days apart from the first and second cases, while the interval between the second and third cases was reduced to five days.

It can be seen that his murder rate is clearly accelerating.

Whether it is for mission, entertainment, ideal faith or simply as a cause to become serial killers, there is no doubt that they can reap some satisfaction from the activity of killing.

It's like people who are obsessed with games or swords, but serial killers are obsessed with killing.

After each sword, people usually have so-called sage time, and the "cooling period” is like sage time for serial killers.

Serial killers get their excitement to a peak through a murder experience, and then their emotions gradually fall back, rejuvenate their previous experiences, learn from experience, and continue to learn until the next one.

This is also a troublesome place, because you are facing an evolving opponent, and you can see by the shortening of the cooling period that the emotional stimulus that murder can bring to him is slowly diminishing, which is why he needs to be met with more frequent crimes.

If Zhang Heng remembers correctly, on the third day after the first letter, two more murders occurred in the East Side, but one of them was committed differently. Researchers in future generations generally believed that the case was not committed by Jack the Ripper himself, but it was not clear whether it was the masterpiece of the imitator or whether someone touched the fish with water, and blamed Jack the Ripper after the murders.

In short, there is not much time left to Zhang Heng, and Zhang Heng does not want any more victims if possible, so the best result is to find the killer within three days. Of course, considering that the killer's time is now much faster than in history, he does not necessarily have three days left, in addition to which he needs to race Holmes.

Zhang Heng did not delay the time. After examining the body in the morgue, he rushed back to the crime scene. However, after the incident had been cleared for so long, all the suspected evidence had been collected by the police, and there were still some traces of blood on the ground. However, there were not many other clues that could be collected, but the location chosen by the murderer was becoming bolder and bolder.

The likelihood of being spotted from the initial dark alley, to the garage area, to the fence behind the apartment, is increasing from floor to floor.

Zhang Heng marked the three crime scenes on the map, and then went to visit the first person to find the body and the last person to see the victim based on the address provided by the short police officer. These people have obviously also been harassed for a long time by journalists and police and various snoozers, and Zhang Heng just said his intentions seem very impatient.

But seeing the latter pull the gold out of their pockets, all of them have become enthusiastic and hospitable again, tired of repeating what has been said many times these days.

This information has already been seen in reports provided by the police, so this is not his focus.

Thanks to the blessings of future generations of Ripper enthusiasts, Zhang Heng already has some lists of suspects in his hands. The exact age of the names may not be useful, but the corresponding professions and motives are very informative.

For example, a retired sheriff in a later life thought Jack the Ripper was a seaman on a German merchant ship, because the White Church area was close to the pier, and because each time the merchant ship arrived and left London coincided with the time of the victim's murder, he speculated that the killer was likely a seaman, and then mysteriously disappeared because he went back to the United States on that boat.

Zhang Heng, on the other hand, can inquire about the presence of sailors in the vicinity of the person who last saw the victim the night of the incident.

Beyond that, there are similar theories of royal conspiracy, barber theory, midwifery… this belongs to the wisdom of the crowd, and each theory has its own entry point, but the effect of a lap down is not ideal, what witnesses say, does not form a sufficiently uniform caliber.

Zhang Heng realized that he might have lost his way. Of course, since he had such advantages in his hands, he had to try them out.

He has been busy all the way to lunch, and the sun is about to go down. Zhang Heng is no longer going on. He has a lot of places to run this day. The information is also very varied. It is time to stop and sort out his thoughts.

Zhang Heng returned to 221B Baker Street and saw that Holmes had finished his dinner and was dealing with a dessert plate.

He still didn't look too slow. Zhang Heng came back and looked up. "How was your harvest today? ”

“I haven't got a clue yet, have you? ”

“I've found a very useful clue that I'm digging deeper along, and it should turn out tomorrow.” Holmes laughed, "May I share a hint with you, my dear Eastern friend? ”

Zhang Heng shook his head, “Early runners don't necessarily get to the finish line first. ”

“That's good, but early runners always have an advantage, and I'm already picking out which opera to watch.” Holmes Road, look at Zhang Heng sitting opposite him.

Mrs. Hudson took out the rest of the dinner in the kitchen, with salted meat, peas and bread, and a few fruits, while the dessert after the meal was pudding, Zhang Heng quickly finished eating, a mouthwash returned to the bedroom and took out the revolver she had bought three months earlier, in addition to a kerosene lamp and a knife.

Holmes raised his eyebrows and had an accident, "Are you going back? ”

Zhang Henghun shouted, "The guy may have committed a crime in the near future, and even if I don't meet him, I can visit the environment and situation at the previous crime scenes at night," he added. "By the way, get to know the group of gorges. ”

“Nice,” Holmes praised, "you're getting more and more integrated into the city. ”