Outside San Francisco, a sting of NGI's--violent sociopaths found not guilty by reason of insanity--have been sent back into society, and, one by one, mysteriously disappeared.... Beautiful psychologist Alison Chapley wants to know why and sets off on a search for answers that lures her and her former lover, medical examiner Carroll Monks, into a menacing and increasingly macabre dance with a brilliant psychopath known only as Naia.... Naia's perverse...