In her Manhattan apartment, bestselling mystery author Caitlin Bennett holds the latest of the threatening letters sent to her by a deranged "fan". She hires ex-cop Connor "Mac" McKee as a bodyguard. With Mac's protection, Caitlin begins to feel safe. But the city is in the grips of a massive snowstorm and a serial killer targeting women who bear a striking resemblance to Caitlin. Can Mac keep her safe from a madman's deadly agenda?