Lin Xiuyi now had a general impression of the Green River Killer in his mind, he might have more than one car, one of which could carry multiple corpses at once. Because some of the victims are teenagers, they are actually more picky about the choice of their customers. Young ** tend to be apprehensive when picking up customers for the first time, so the Green River Killer should at least look less aggressive and generous.

From the three cases discovered so far, Lin Xiuyi found that since the first case in 1982, the Green River killer has quite mature criminal skills. If you consider it from this point, it is likely that the Green River Killer has had several less successful crimes before this. If calculated based on age, the Green River Killer's first offense is likely to occur in the juvenile stage.

The Green River Killer should have a place where they can keep their prey captive for a long time, as all of their victims have traces of long-term abuse. In addition, there must be a reason why the Green River Killers have such a strong hatred for this particular group.

There is no such thing as a natural killer in the world, and mature killing skills require constant attempts by murderers to master. The reason why the Green River Killer can successfully commit crimes again and again is because of a set of criminal methods that can perfectly avoid the investigation of the police and FBI technology. Although the police can find a lot of evidence at the crime scene, these evidence can only guide the police to find the identity of the victim, and there is very little evidence that can point to the identity of the Green River killer.

If the Green River Killer is defined in terms of the binary analysis created by the FBI's Behavioral Science Division, he is clearly an organized serial killer. The Green River Killer knows how to plan well before he acts, he will carefully pick his prey, and he will be very experienced in coaxing them into the car, and then slowly torturing these poor girls.

Lin Xiuyi had a hunch that his pursuit of Mary was meaningful, because there was still an unsolved mystery waiting for Lin Xiuyi to solve before Mary was killed, that is, why Natalie's credit card was in Mary's hands.

It's a pity that the provocation of the Green River Killer disrupted Lin Xiuyi's search plan, and there was not much time left for him. A lust-driven indulgence killer with a negligible cooldown for crimes. Who knows when the next body will be found, a day later, two days later, or a few hours later.

Chief Musk has communicated with the Seattle Police Department, and in order to prevent the Green River Killer from succeeding again, the Seattle Police Department has agreed to increase the security level of Highway 90 in a short period of time, and will be equipped with patrol cars to patrol Highway 90 24 hours a day at night. However, this is only a stopgap measure, and it is not a symptomatic treatment.

And after Sean reported the investigation during this period to Director Musk, Director Musk agreed that Sean and Lin Xiuyi would continue to follow the clues of the victim Mary.

In the week before Mary's body was found, she had been seen at a gas station on Route 90, according to surveillance footage found by Lin Xiuyi at the gas station, which was the last time Mary was seen in the public eye. Shortly thereafter, Mary was brutally murdered by the Green River Killers. What happened that week? Lin Xiu didn't know.

"Sean, we now know at least one thing, and that's that Mary had spent money at the gas station a week ago, and according to the bank bill, Mary had filled her car with 10 gallons of gas. Now I wonder how much gas is left in Mary's car, and can we calculate how far Mary's car has traveled after filling up with gas?"

Lin Xiuyi found an opportunity to ask Sean about the gasoline in Mary's car. The gas station Mary used to visit was located on the outskirts of Seattle, and Mary's car was parked within the limits of downtown Seattle. If the gasoline consumption in the car is not much, Lin Xiuyi can rely on these data to roughly give a vehicle's activity radius. And within this radius, it is very likely that there is a foothold for the Green River Killer.

After hearing Lin Xiuyi's detailed explanation of his thoughts, Sean's frowning brows finally relaxed a little. Sean quickly reported the matter to Director Musk. Director Musk made a special trip to call Lin Xiuyi into his office and asked Lin Xiuyi about gasoline.

"Chief Musk, let me ask you a question, if you were a Green River killer, would you refuel a car that is about to be abandoned?"

As soon as Lin Xiu asked, Director Musk was speechless. Yes, if I had known that this car would be abandoned in the parking lot along with the corpse, then according to ordinary people's thinking, naturally this car would not be refueled.

"So, sir, we now know that the car was once filled with gas at a gas station on Route 90, so how far the car has traveled from that time onwards, there is always a stretch of the road that hides the Green River Killer. Because there's a good chance that the Green River Killer won't notice the change in fuel as he drives the body from his hiding place to the parking lot. I think this is one of the few oversights of the Green River Killer so far......"

Lin Xiuyi was just halfway through speaking, Director Musk had already understood the meaning of Lin Xiuyi's explanation, and he got up from his seat excitedly, with a rare smile on his face.

"Amazing, how did you come up with it. Director Musk patted Lin Xiuyi on the shoulder and complimented.

"Sir, Detective Sean and I have been tracking down the whereabouts of a missing girl, and I also inadvertently discovered the whereabouts of the victim Mary from the surveillance video of the gas station......," Lin Xiuyi said modestly.

……

Half an hour later, experts from the Seattle Sub-Bureau's Crime Lab carefully studied the remaining volume of gasoline in the tank according to Lin Xiuyi's ideas, and estimated that the consumed gasoline should be about five gallons, or about 19 liters. According to the displacement and fuel consumption of this car, it can travel about 95~130 miles, which is about 150~200 kilometers.

The rest of the work is a completely mathematical problem, how to run a distance of 95~130 kilometers between the gas station and the parking lot where the body was found, and all the paths along the way are where the Green River killers may be hiding.

Lin Xiuyi didn't stay in the lab all the time waiting for the final result, he had to go to a rental car shop after work to pick up the GTR he had modified, but at 10 o'clock in the evening, Lin Xiuyi received the final result from the crime lab on his mobile phone. According to Lin Xiuyi's thinking, the computer successfully compressed the hiding place of the Green River Killer to a 50-square-mile radius along Highway 90.