Eliot Ness and the Untouchables set their sights shutting down the numbers racket. The numbers are like a lottery where anyone can place a bet of up to one dollar on a three digit number. The payout for a full dollar bet is $600 so the profit for the mob, who run the racket, is the remaining 40%. Ness wants to shut down that cash flow which can be used for more heinous crimes. They think they may have an in when one of Al Morrissey's collectors is stabbed. Ness pressures Agent Marty Flaherty to make contact with Morrissey, an old friend who once saved his life. Before he can do anything, the Chicago police arrest Morrissey for gambling violations and Marty focuses on Al's son, Phil Morrissey but with little luck until his father pays the price for being connected to the mob.