Season Three of The Untouchables begins with a return guest-star appearance by Peter Falk, this time in the role of mob troubleshooter Nate Selko (a character reportedly based on real-life gangster Murray "The Camel" Humphries). When Elliot Ness (Robert Stack) begins bearing down on the illegal punchboard racket, the Syndicate brings Selko in from Chicago to handle the problem. Failing to buy Ness off with a $500,000 bribe, Selko manages to frame the Federal agent for murder. D.A. Asbury (Frank Wilcox) allows the Underworld to believe that Ness has been disgraced and demoted so that Elliot can put on an "embittered drunk" act, the better to lure Selko and his entire organization into a well-concealed trap.