Robert and Alison Logan were married less than a year when Alison boarded American Airlines Flight 77 on the morning of September 11th, 2001. Later that morning, Robert watched in horror as televised news reports told him that Alison's fight had been hijacked and crashed into the Pentagon. Eight years later, Robert has pulled his life back together and relocated to the Midwest. Still haunted by the memory of Alison, he has married Rachel, a clinical psychiatrist, and they share an idyllic life with Rachel's daughter Carly. The peaceful calm of Robert and Rachel's life is torn apart when a research project Rachel is working on includes a brain damaged patient at a secure hospital who bears a striking resemblance to Alison. Both Robert and Rachel embark on their own personal investigations, for separate reasons, to discover the truth about the woman in the hospital.