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James Mason stars in The Upturned Glass as a prosperous British brain surgeon. Mason saves Rosamund John's daughter from blindness, whereupon the married John falls in love with the doctor. The illicit lovers conduct a passionate affair while John's husband is out of the country. When John dies mysteriously, Mason suspects that the culprit is his own jealous sister-in-law Pamela Kellino (Mason's real-life wife at the time). Acting on his suspicions, Mason murders Kellino, stuffs her body in the trunk of his car, and drives to parts unknown to dispose of the corpse. Before he is able to do this, Mason is called to the home of a dying child. Despite the risk of being exposed as a murderer, Mason leaves his car unattended to rush to the side of the stricken child. The film doesn't end very happily for Mason, but he is mildly comforted by the fact that he has remained loyal to the Hippocratic oath. Upturned Glass is a virtual compendium of late-1940s British melodramatic devices: tortured hero, well-planned crime, moonlight-drenched photography, lengthy flashbacks, quasi-classical music score, and the rest of the repertoire. The film was coproduced by James Mason, and cowritten by Mason's wife and costar Pamela Kellino.