Eliot Ness sets out to bring down Frank Makouris, who controls New York's Fulton Fish Market by intimidation and murder and who is responsible for the price of fish going up nearly 50%. Frank's boss, gangster Joe Kulak, tells Frank to lay low until Ness leaves, but Frank ramps up his terrorizing of the market, until Kulak is forced to throw a low-ranking hood to the feds as a sacrificial lamb in order to take the heat off himself. Unfortunately, it doesn't work out as planned.