The book unfolds from the perspective of the protagonist, a "gentle, kind, sensitive, and helpful bookstore owner." All psychological activities, conversations, and action records are all true, but key crime memories are deliberately concealed, self-motivations are tampered with, and self-suspects are weakened.
The readers, the police in the book, and the supporting characters are all deceived until the ultimate twist in the ending. From the beginning to the end, the protagonist is the only real murderer. She planned all the perfect unsolved cases and serial murders.
Intent: Evil that cannot be judged by law is liquidated by private justice