An investigation into the murder of a young pharmacist leads Harry Bosch and San Fernando's detective squad into the big-business world of pill mills and prescription-drug abuse at the same time that an old case from Bosch's days with the LAPD returns to haunt him.

"A series of shootings exposes San Francisco to a methodical yet unpredictable killer, and a reluctant woman decides to put her trust in Sergeant Lindsay Boxer. The confidential informant's tip leads Lindsay to disturbing conclusions, including that something has gone horribly wrong inside the police department itself. The hunt for the killer lures Lindsay out of her jurisdiction, and gets inside Lindsay in dangerous ways. She suffers unsettling medical...