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This book is a mystery novel, but it is not just a mystery novel. The fate of the characters and personal emotions are interspersed in it. The story of this book has twists and turns and is cleverly conceived. It does not rely on detectives or police, and there is no blood or violence. Instead, it relies on a middle-aged female writer with a gentle temperament, integrity and elegance. With wisdom and courage, starting from a subtle trilobite pattern, through layers of reasoning, she perfectly combines several seemingly isolated cases, thus revealing the crime.