At first, TV star Sarah Broughton thinks the letters she has been receiving are from a typical fan—someone a little strange, perhaps, but harmless. But when her admirer starts threatening Sarah and her loved ones, she turns to detectives Arvo Hughes and Maria Hernandez of the LAPD Threat Management Unit—experts in pursuing the most dangerous of stalkers. Pitted against a frighteningly twisted mind, the detectives test their expertise and experience to the limit in the desperate race to save Sarah's life.