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Elliot Ness (Robert Stack) goes undercover again, this time motivated not so much by a sense of duty as by loyalty to his old friend Captain Johnson (Robert Bice). The captain's own son has been picked up in a drug raid, and Ness vows to track down the supplier of the illegal narcotics, a particularly slimy character named Peepers (Robert Ellenstein)--who turns out to be only a flunkey for the "big boy", Sal Rudin (Robert Emhardt). And that is how Ness ends up in New Orleans, wearing a bow tie and straw hat and impersonating a jazz musician named Artie Tresh. Unfortunately, Ness' cover may be blown when sexy singer Lorna Shaw (Jacqueline Scott) falls for the incognito Fed.