Samantha Caine, a mild-mannered suburban schoolteacher, suffers from amnesia and has no memory of her life before the past eight years. When a car accident triggers some fragmented memories, Samantha enlists the help of a low-rent private investigator, Mitch Henessey, to delve into her mysterious past. As they uncover clues, it becomes evident that Samantha had a dark and dangerous previous life. Gradually, she begins to display skills and instincts far beyond those of an average person, hinting at a past deeply rooted in violence and espionage.

Their investigation draws unwanted attention and peril, revealing Samantha's true identity as a highly trained government assassin named Charly Baltimore. As the pieces fall into place, Samantha and Mitch find themselves on the run from sinister forces determined to eliminate them. With time running out and danger closing in, they must navigate a treacherous path to uncover the full truth about Samantha’s former life, while simultaneously thwarting a deadly conspiracy that threatens far more than just their lives.