A first-year resident at a major
Boston children's hospital, Peyton Shields finally has the career she's
always dreamed of—even though her marriage to Kevin, an up-and-coming
young lawyer, is suffering from her hard work and impossibly long hours.
But a late-night drive home in a heavy snowstorm changes everything
when she is forced off the road.
No one, not even Kevin, believes
Peyton's claims that the "accident" was deliberate. Suddenly, her
wonderful life has turned dark and uncertain, and the terror has only
just begun. Her husband is growing inexplicably distant and bitter,
accusing her of paranoia, betrayal, and infidelity. And a series of
bizarre and frightening events is moving Peyton steadily closer to a
faceless, resourceful enemy who is watching her every move.