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What role does Gloria Grahame’s character play in The Big Heat?

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In the 1953 film noir The Big Heat, directed by Fritz Lang, Gloria Grahame portrays Debby Marsh, a character described as an ill-treated mob mistress or "moll."1

Following the murder of detective Dave Bannion’s wife, Debby Marsh plays a pivotal role by teaming up with Bannion to help him exact vengeance against the corrupt forces and mobsters responsible for the tragedy. Her character serves as a key ally to the protagonist, contributing to the film's reputation as a definitive example of the genre.1