Murder in the Past

This book tells a strange murder happening in the grocery opposite to Nanming High School and the only witness is a 13-year-old son of the dead person in a summer night with heavy downpour. Fifteen years later, the case has not yet been solved, and the police officer who was responsible for the case died in line of duty. In preparation for the funeral, the daughter of this dead police officer found the murder a strange purple scarf. How would she complete the last wish of his father? An interlinking murder, a social tragedy, and a pure but desperate love emerge.