The Long Kiss Goodnight (1996)

Samantha Caine is a suburban school teacher suffering from amnesia. When Caine's mysterious past begins to haunt her idyllic life, she sets out on a desperate search to discover her true identity. Aided by Mitch Henessey, a dead-beat private detective, the two follow a trail of clues into the middle of a conspiracy led by rogue elements of the U.S. intelligence community and a notorious international arms dealer. They slowly learn that Caine is much more than a PTA mom who cooks a mean lemon meringue pie. Repressed from her memory is her former life as Charly Baltimore, a highly trained secret agent involved in the government's most unscrupulous affairs. Submerged in a murky underworld with no boundaries for survival and no one they can trust, Henessey must help Samantha rekindle her dangerous past. For without the full extent of her lethal skills, they will never be able to confront Timothy, a vindictive enemy who's plotting one of the most heinous acts of urban terrorism ever devised.