When Stacy Peterson vanished without a trace in October of 2007, her husband, retired police sergeant Drew Peterson, steadfastly asserted his innocence and maintained that his wife had run off with a lover. Months passed, and questions were raised about their marriage, about Stacy's vocal concerns for her safety, and about Drew Peterson's own bizarre behavior in the limelight. In February of 2008 came another shocking development: after a second autopsy, the unusual accidental drowning of Kathleen Savio, Peterson's third wife, was ruled a homicide. As the case unravels against Drew Peterson in the suspicious deaths of his wives, one haunting question remains: where on earth is Stacy?