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**Introduction to the story of "The Mystery Under the Keys"** This is a detective novel that combines Chinese classical music culture and modern criminal investigation suspense. The story begins with the famous pianist Zhou Mo being murdered in the secret room of his home. His body was found on a Steinway piano with mysterious symbols painted in blood between the keys. Jiang Mengxue, the leader of the serious crime team, was responsible for investigating the case. She accidentally discovered that the blood symbol actually matched the \