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. Unbeknown to anyone, Lamberto had recently approached Eliot Ness with a proposition: he would be prepared to roll up his entire operation and retire if the District Attorney would ensure no jail time from his upcoming trial on tax evasion. Soon, both Lamberto's associates and Ness are looking for him with the Brannon brothers in the middle.