This is #10 in the Harry Bosch series. Former LAPD detective Harry Bosch is drawn into a compelling case when The Poet, a serial killer long thought dead, resurfaces. Meanwhile, Rachel Walling, who once worked on the original investigation, is in South Dakota trying to rebuild her life. When the new murders begin, Bosch and Walling must reconnect and follow the trail of clues through corrupt systems, hidden allegiances, and personal ghosts.