"Night Call" is a 1964 episode of the American television anthology series The Twilight Zone directed by Jacques Tourneur.
The story follows an elderly woman, played by Gladys Cooper, who receives persistent disturbing phone calls from an anonymous caller.
The episode is based on Richard Matheson's short story "Sorry, Right Number" which appeared in the November 1953 issue of Beyond Fantasy Fiction.
Up until now, the pattern of Miss Keene's existence has been that of lying in her bed or sitting in her wheelchair, reading books, listening to a radio, eating, napping, taking medication—and waiting for something different to happen.
Elva and her housekeeper visit the cemetery where she finds that the line is resting on the grave of her long-deceased fiancé, Brian Douglas.
Case in point, Miss Elva Keene, who in every sense has made her own bed and now must lie in it, sadder, but wiser, by dint of a rather painful lesson in responsibility, transmitted from the Twilight Zone.The caller is never identified in the original short story.
The short story creates a heightened level of horror because the unknown speaker on the phone gradually improves in cognition and speech to the point where they seek to interact with her physically, conjuring up images of the walking dead and reanimated corpses.