Ness arranges parole for convict Al Remp, in order for Remp to obtain information enough to convict his old boss, bootlegger Fat Augie Strom. Remp's wife is not informed about the fact that Remp is actually working for Ness, and begs Ness to put her husband back in jail where she feels he's safe from the temptation of power. As he works his way up in Strom's organization, will Remp be able to resist the idea of going back to his old way of life?

Johnny Mizo has been on the lam for several years working as a seaman on cargo ships. He left the country after stealing $200,000 from mobster Vince Majesky who has been waiting patiently for his return. On Mizo's arrival in the U.S., Majesky has his hoods waiting for him but they kill the wrong man so both Majesky and Eliot Ness are now on the lookout for him in Chicago.