"Well? Did you find anything?" Lu Kuan saw her staring blankly at the ground and assumed she had discovered something.
"Judging from the traces wiped away at the scene, the murderer had a strong ability to counter-surveillance, leaving no clues whatsoever," Su Xiaonuan said.
“Isn’t that right?” Yu Yang said, his head aching. “He’s openly provoking us. Seven years have passed, and even with the combined efforts of several police stations, we haven’t been able to find the killer. We thought that with your help, we could stop him from killing again this year, but we never expected him to move the killings forward again. It’s truly unexpected!”
"It must be a psychopathic killer!" Su Xiaonuan pried open the victim's mouth. "The victim's mouth was stuffed with paste, which is a very important clue and may be the breakthrough in this case."
“Every household has glue, isn’t this like looking for a needle in a haystack?” Lu Kuan said. “We’ve thought about this approach before, but we still haven’t come up with anything.”
“No, this time is different.” Su Xiaonuan shook her finger. “At the end of the year, every household has paste to paste New Year pictures and couplets. But now there are still a few months until the New Year, so there are definitely not many households that need paste. I just looked, and the paste in the deceased’s mouth was not the kind of paste sold in stores. It should be paste that was made at home. Moreover, the technique of making paste was quite good. It must be because he makes it often to have this level of skill.”
"That's a real eye-opener!" Lu Kuan said excitedly. "I'll have someone investigate immediately to see which industries use large amounts of paste, and then follow the trail."
"Be careful not to alert him!" Su Xiaonuan added. "This is a psychopath, and a educated one at that. We need to prevent him from making a desperate move and from harming more innocent people. Judging from the timing of his killings, he must have encountered some major event. We can investigate secretly from these aspects."
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