When John Haddrell dies of a heart attack at the wheel of his car, the woman at his side is not his wife Margaret but his lover, Julia. Recovering from the injuries she sustained in the ensuing crash, Julia is visited by Margaret, who apparently knows nothing of the affair. Events take a sinister turn when Margaret begins to encroach on Julia’s life, engineering Julia’s dismissal of her home help, Gary, and her estrangement from her counsellor, Anne. Left alone in the house together, Julia and Margaret are locked in deadly combat.
Directed by David Midlane