ADVENTURE / THRILLER. He walked away from the job three years ago. But Harry Bosch cannot resist the call to join the elite Open/Unsolved Unit. His mission: solve murders whose investigations were flawed, stalled, or abandoned to L.A.'s tides of crime. With some people openly rooting for his failure, Harry catches the case of a teenager dragged off to her death on Oat Mountain, and traces the DNA on the murder weapon to a small-time criminal. But...