Harry Bosh, detective de la policia de Los Angeles, es un lobo solitario. Hijo de una prostituta asesinada, fue criado en orfanatos y quedo marcado tras vivir la dura experiencia de Vietnam. Ahora, un caso rutinario de muerte por sobredosis le devuelve inesperadamente al pasado. La victima, Billy Meadows, habia servido en su misma unidad en Vietnam. Ambos habian combatido en la red de pasajes subterraneos del Viet Cong y habian experimentado el horror del eco negrola reverberacion en las tinieblas de su propio panico. Ahora Meadows esta muerto. Pero su rastro parece apuntar a un gran atraco bancario perpetrado a traves de los tuneles de alcantarillado. / When Harry Boschformer hero cop bumped from the L.A. homicide desk to the lowly Beverly Hills squadgets the call on a death at Mulholland Dam, he recognizes the corpse as that of a fellow soldier in Vietnam. Together they had searched for Viet Cong in burrows beneath Vietnamese villages, and had both experienced the ""black echo"" of their own panic reverberating in their ears. Further investigation connects his old pal to an unsolved bank jobstorm drains tunneled into the bank vault. When Harry and beautiful FBI agent Eleanor Wish uncover the connections between Vietnam and the bank job, both are put in danger by deadly ex-Marines and a powerful insider from either the LAPD or the FBI itself.