I think the whole story was fabricated by the old detective in order to hang out the last red trout. The real murderer is the psychologist. During the whole process, the professor had long been acquitted of the crime, but the old detective would not tell the psychiatrist.
The reason why the psychiatrist committed the crime again was that he felt that he was running out of time (this point when he finally returned home and opened the door to make pain in his left hand, which is a sign of heart disease), and wanted to do more. The reason why the professor can’t be the murderer is that when he kidnapped the little girl, he actually asked the girl to call the kitten’s name, and the call was very loud. The old detective clapped his hands and the neighbors noticed it, and the call was so loud. Will no one find out? Therefore, the story of the professor's killing process was compiled by the old detective to lead the psychologist.
At the beginning and the end of the film, there are details of looking in a small mirror. All the fabrications, speculations, and deceptions are all for breaking through the last line of defense of the psychologist, locking up his criminal evidence many years ago, and solving the serial murder case, wonderful!
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