The Upturned Glass is a 1947 British film noir psychological thriller directed by Lawrence Huntington and starring James Mason, Rosamund John and Pamela Kellino.

Michael Joyce, a Harley Street brain specialist, unhappily married and separated from his wife, falls in love with Emma Wright when she brings her young daughter Ann for consultation.

Retrieving her corpse from the courtyard below and placing it in the car's back, he drives toward the cliffs just over the sea, where he intends to dispose of Kate's body.

On the way, however, he encounters a stranded doctor, a general practitioner, who begs a ride to the home of a patient, a 12-year-old girl whose survival of a head injury is doubtful.

Resuming his trek toward the sea with Kate's body, Michael undergoes the realization that he is not "perfectly sane" and that perhaps his status as a "valuable member of society" is indeed questionable.

In the mid 1940s James Mason was the biggest star in British films, coming off successes like They Were Sisters (1945), The Seventh Veil (1945) and The Wicked Lady (1945).

They dropped the idea after learning of the Hollywood production Devotion, and instead developed a psychological thriller under the same title, in which both Masons would play leading roles.

However after Mason was unable to secure the services of the actors they wanted, Celia Johnson and Phyllis Calvert, the script was rewritten.

For his work on The Upturned Glass, Mason, who at the time had "enormous drawing power", received the equivalent of $240,000 in U.S. dollars, plus a percentage of the profits.