Samantha Caine (Geena Davis) is a school teacher who can remember nothing about her life prior to being discovered eight years previously. When she begins to have flashbacks to her past, she is helped by detective Mitch Henessey (Samuel L. Jackson) to find out that she is a former CIA assassin, who was nearly killed when a job went wrong.
Now people in high places want to prevent Sam digging any deeper into the past, which spells danger for her and Mitch.