The Glass Cage (US: The Glass Tomb) is a 1955 British 'Hammer Film Productions' drama mystery film. It features John Ireland, Honor Blackman, Geoffrey Keen, Eric Pohlmann, Sidney James, Ferdy Mayne, Liam Redmond, and Sydney Tafler.
A circus barker stages a sensational new act, the world's longest fast undertaken by "Sapolio", on view in a glass cage. But this act also results in several murders, a kidnapping, and a poisoning!