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 Ellie Hatcher is convinced that the online threats are more than just empty words.

With smooth, straight-talking partner J. J. Rogan at her side, Ellie tries to identify Megan's enemies, but she begins to wonder if the co-ed’s murder was more than just the culmination of a cyber obsession. Phone records reveal a link between Megan and a murdered real estate agent who was living a dangerous double life. The detectives also learn that the dead real estate agent shared a secret connection to a celebrity mogul whose bodyguard was mysteriously killed a few months earlier. And when Megan's roommate suddenly disappears, they know they have to find her before another young woman dies.