"The Black Echo" is a crime novel written by Michael Connelly, published in 1992. It is the first book in the Harry Bosch series, featuring the character of LAPD detective Harry Bosch. The story revolves around Bosch's investigation into the murder of a fellow Vietnam War veteran, which leads him to uncover a complex web of crime and corruption. The novel explores themes of trauma, the impact of war, and the pursuit of justice. As Bosch delves deeper into the case, he confronts his own past and the haunting memories of his time in Vietnam, which play a significant role in shaping his character and motivations.