The Black Echo by Michael Connelly in Paperback

Join LAPD detective Harry Bosch, the star of Amazon Prime's Bosch, as he returns to where it all began in his first case The Black Echo - a thrilling, action-packed novel. Bosch, a loner and night owl, receives a call on his pager one Sunday. A body has been discovered in a drainage tunnel in Hollywood's Mulholland Drive. At first glance, it appears to be a routine drug overdose, but the presence of a new puncture wound among the old scars raises doubts for Bosch. To make matters worse, the victim is someone Bosch recognizes - Billy Meadows, a former "tunnel rat" in Vietnam who they all nicknamed "the Black Echo." Bosch can't help but feel responsible for what happened to him. down Billy Meadows once before, so now he is determined to bring the killer to justice.