Harry Bosch works cold cases as a volunteer for the San Fernando police department when he s called out to a local drug store where a young pharmacist has been murdered. Bosch and the town s three-person detective squad sift through the clues, which lead into the dangerous, big business world of prescription drug abuse. Meanwhile, an old case from Bosch s LAPD days comes back to haunt him when a long-imprisoned killer claims Harry framed him and that there s new evidence which proves it. Bosch left the LAPD on bad terms, so his former colleagues aren t keen to protect his reputation.He must fend for himself in clearing his name and keeping a clever killer in prison.The two unrelated cases wind across each other like strands of barbed wire