Mickey Haller gets the text, "Call me ASAP - 187," and the California penal code for murder immediately gets his attention. When Mickey learns that the victim was his own former client, a prostitute he thought he had rescued and put on the straight and narrow path, he knows he is on the hook for this one. He soon finds out that she was back in LA and back in the life. Far from saving her, Mickey may have been the one who put her in danger.