When an infamous serial killer known as the Poet reemerges, FBI agent Rachel Walling, long haunted by her unsuccessful efforts to bring him to justice, receives assistance from LAPD detective Harry Bosch.
Confronted by his own tragic past when the bones of a twelve-year-old boy are found in the Hollywood Hills, Harry Bosch attempts to unearth the boy's identity, which leads to startling discoveries and the possible destruction of his career.