The Intruder (1999)

Catherine meets Nick by accident and, after a whirlwind romance, the two get married and Catherine moves into Nick's apartment only that's the start of problems when an unseen intruder begins playing strange mind games with Catherine in an apparent attempt to drive her insane. Catherine first suspects Nick is behind it, then suspicion moves to his business partner Badge, then to Nick's friends, until Catherine suspects that Nick's first wife Stella, who commited suicide years before, may be behind the occurrences which she may be committing from either beyond the grave, or by a time vortex within the apartment itself which may have let to her suicide in the first place.