When fresh-faced college student Chelsea Hart is found murdered in East River Park, her wavy blond hair brutally hacked off, NYPD detective Ellie Hatcher catches the case--and finds herself under the watchful eye of a psychopath eager to add the prideful young female detective to his list of victims.

When New York University sophomore Megan Gunther finds personal threats posted to a Web site specializing in campus gossip, she's taken aback by their menacing tone. Someone knows her daily routine down to the minute and is watching her—but thanks to the anonymity provided by the Internet, the police tell her there's nothing they can do. Her friends are sure it's someone's idea of a joke, but when Megan is murdered in a vicious attack, NYPD Detective...