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The Black Box - Michael Connelly (Harry Bosch, Book 16)
In a case that spans 20 years, Harry Bosch links the bullet from a recent crime to a file from 1992, the killing of a young female photographer during the L.A. riots. Harry originally investigated the murder, but it was then handed off to the Riot Crimes Task Force and never solved. Bosch's ballistics match indicates that her death was not random violence.