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An Anonymous Tip Puts Bosch On A Case That Has Remained Unsolved For Decades, The Vicious Stabbing Of A Teenage Boy Whose Body Was Found In An Abandoned Old Hollywood Restaurant. Working A Cold Case Is Tough, But Bosch Gets A Lucky Break When Dna Evidence From The Murder Weapon Points To A Known Kiler. But The Da Insists That Science Alone Is Not Enough, So Bosch Has One Chance To Get A Confession.