That's what Tim Blake finds himself asking when his daughter Sydney vanishes into thin air. At the hotel where she was supposedly working, no one has ever heard of her. Even her closest friends can't tell him what Sydney was really doing in the weeks before her disappearance. Now as the days pass without a word, Tim is forced to face not only the fact that Sydney is missing but that the daughter he's loved and nurtured, the daughter he thought he knew as well as anyone, is a virtual stranger.
As he retraces Sydney's steps, searching for clues to her secret life, Tim discovers that the suburban Connecticut town he always thought of as perfectly ordinary has a darker side. But what he doesn't know is just how dark. Because while he's out searching for his daughter, questioning everyone who might have known her, someone is watching him.
For Tim isn't the only one who'll do anything to find Syd. Whatever trouble she's in, there's a lot more on the way...and it's following in Tim's footsteps. The closer Tim comes to the truth, the closer he comes to every parent's worst nightmare...and the kind of evil only a parent's love has a chance in hell of stopping.