Schoolteacher Samantha Kane leads a peaceful life as a schoolteacher, raising a young daughter and unaware of her bloody past. After all, she was once agent Charlie Beltimore, performing secret missions for the CIA. After the accident, shocked by the unexpected return of some of the skills of a professional hitman, Samantha tries to make sense of her past. Detective Mitch Hennessey, who began by investigating the life of a simple teacher, finds himself drawn along with Samantha into a secret CIA operation….