It's hard to tell who is out to get who in this thriller. The story centers around Donny, who has horrible nightmares and flashbacks from the Vietnam war, and his wife Mara. The couple lives in the huge house Donny grew up in. Dinah's part isn't major. She plays Donny's sister Jill, who moves back to town to be near him. At first I was sympathetic to Mara for having to put up with Donny and his constant struggle with the past. But we soon find that Mara has hatched a vicious plan to drive Donny to the grave. Her plot backfires when, instead of committing suicide like Mara hoped, Donny ends up catatonic.
At a bar, Mara meets mysterious Reed, who practically becomes her live-in lover. When odd things start happening around the house (like broken mirrors, things turning up in different places, weird noises), Mara wonders what's going on. At first she suspects Jill of trying to drive her out of the house (figuring she's the only one who knows the house, having grown up in it, and who had the opportunity to do the things). So Mara, who has legal control of the care of Donny, tells Jill she can't see her brother at all.
But when the strange occurrences continue, Mara believes that Donny isn't actually catatonic and becomes more determined to kill him. She forces Reed to actually do the deed while she visits a friend. When she returns to the house she finds Reed dead. She gets Donny's gun, goes to his room where he sits in his wheelchair, aims, and fires. It then cuts to the next day (or maybe a couple days later). We find that Donny had plugged the gun and when Mara fired it nearly blew her own face off. Reed is alive, and is actually Donny's old war buddy. Confused?