Jerry Shaw is an amiable slacker with an over-achieving twin brother. After his twin dies in an accident, strange things happen to Jerry at a dizzying pace: a fortune shows up in his bank account, weapons are delivered to his flat, and a voice on his cell phone tells him the police are on their way. Jerry follows the voice's instructions, and soon he and a woman he's never met are racing through the city, on to a plane, and eventually to the Pentagon, chased by the FBI. She is Rachel Holloman, a single mom; the voice has threatened her son's death if she doesn't cooperate. The voice seems to know everything. Who is behind it, what is being planned, and why Jerry and Rachel?Jerry and Rachel are two strangers thrown together by a mysterious phone call from a woman they have never met. Threatening their lives and family, she pushes Jerry and Rachel into a series of increasingly dangerous situations, using the technology of everyday life to track and control their every move.