Rogues (2003)

The result of an old CIA mind-control experiment gone bad, Felice Quick is on the loose and headed for junior high-school choir teacher Sam Blacker. While the crazy Felice eventually convinces Sam that she's his long-lost and thought-to-be-dead sister, she doesn't convince him that the FBI, her ex-employer, is after Sam for past crimes. Under the pressure of her psychological assaults and mind-games, Sam's peaceful afternoon turns into a soul-shattering night. The FBI agents on Felice's trail, Kane Patterson and Arlina Romano, must face their own grief-filled pasts as they dig for clues to Felice's whereabouts. The threads of child abuse and old murders weave a tapestry of mystery that are brought to light in a shocking conclusion.