Sleepy-eyed nice guy Lee Ritter (Michael Blodgett) and his vapid but pretty wife, Susan (Sherry Miles) accept the invitation of mysterious vixen Diane LeFanu (Celeste Yarnall) to visit her in her secluded desert estate. Tensions arise when the couple, unaware at first that Diane is in reality a centuries-old vampire, realize that they are both objects of the pale temptress' seductions.