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Elliot Ness (Robert Stack) dispatches his team to Calum City, a mob-controlled town 30 miles south of Chicago (and obviously based on the real-life Calumet City), when honest mayoral candidate Leon Zabo (Raymond Greenleaf) dies in a suspicious accident. Zabo's demise was actually ordered by Guido Morelli (Anthony Caruso), who controls all gambling activities in Calum City. With the help of Zabo's duaghter Rosetta (Gail Kobe), Ness sets in motion a plan to break Morelli by getting hold of his incriminating financial records--and this time he isn't above using some slightly unethical methods to sweat the truth out of secondary hoodlum Nick Bravo (Jack Elam).