After marrying a handsome man she barely knows, a woman experiences threatening calls and violent attacks from a mysterious woman who claims to be her new husband's former lover.

Just as her life is coming together, Allison experiences a terrible tragedy when her boyfriend is murdered by an intruder from whom the woman herself barely escapes. The police capture a man they believe to be the killer, but Allison, still unsettled, has her doubts. Things take a frightening turn when she meets her friend's new boyfriend and suspects him to be the killer.