Money alone does not make you happy. Money and loneliness even less so. Especially when someone has their sights set on that money. Helen Clarvoe, who is as wealthy as she is unstable, lives alone in a California town. At first, she believes she is the victim of some anonymous lunatic, but soon she must realize that the threatening voice on the phone belongs to none other than her former childhood friend, Evelyn Merrick - Evelyn, who embodied everything Helen wished she could be.