When mobster Charley Radick learns that he has leukemia and only a short time to live, he decides the time has come to visit his daughter, Margaret, now a young woman. When Charley had gone to prison for a 10 year stretch, he had left her with the Wilsons but when he got out, he decided to concentrate on moving up in the rackets and left the girl with them. When he visits the Wilsons however, he's told that Margaret left some three years before. When Eliot Ness learns that Radick is dying, he asks him to come clean and give him the organization's books.

Mike Brannon is a tough cop but his two blocks of Chicago are among the safest there are. He has a tendency to be rough with hoodlums and when he beats up one of Tony Lamberto's boys he finds himself on indefinite suspension. Fed up with his corrupt superiors, he decides the time has come for him to make some money so he enlists his four brothers in a plot to kidnap Lamberto and hold him for $150,000 ransom.