Determined Treasury Department investigator Frank Warren (Glenn Ford) goes after a ruthless mobster known as The Big Fellow. When a key informant is murdered, Warren pursues the gangster on charges of tax evasion. But, with a slick mob lawyer hampering him at every turn, and threats being lobbed toward Warren's wife (Nina Foch), the lawman's chances of achieving a conviction are slim to none. His only hope is that one syndicate bookkeeper will have the courage to turn state's evidence.
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