An expanded radio play and subsequent TV drama, this film builds terrific tension around a bedridden heiress and her telephone.

Sympathy builds for this unlikeable woman, Leona, played by Barbara Stanwyck. She is a spoiled heiress used to getting her own way, but as we come to see, very much created by her father (played by Ed Begley) who bows to all her wishes.

Her husband, Henry, played by Burt Lancaster, whom she chases and captures from her best friend, initially goes along with being an employee in her father's corporation but eventually starts chafing at the restraints imposed on him.

The movie just about plays in real time with the addition of many flashbacks, one of which secures the knowledge that there is nothing wrong with Leona, it is all psychosomatic based on her mother's fatal illness.

From the moment Leona accidentally overhears a plotted murder for later on that evening, the viewer is taken on a ride that builds suspense and tension to a terrifying conclusion and the movie's title.

Not to be missed. The cinematography is superb, a lot of play in light and shade. Barbara deserved an Oscar but lost. 8 out of 10.