Mobster Foots Pulardos, who operates a health gym as a front, plans to flee to Mexico to evade government tax officials. His girl friend, Sugar Pye, suggests that he first arrange for the cremation of a man having his own peculiar identifying characteristic--feet of different sizes--and then apply for a Diners' Club card for use in paying his fare. The request for the credit card comes to the desk of Ernie Klenk, a timid clerk. Nervous about his forthcoming marriage to the boss's secretary, Lucy, Ernie inadvertently okays the application, then, discovering his mistake, rushes to the health gym to recover the club card he has issued. Foots thereupon notices that one of Ernie's feet is larger than the other and decides to burn down the gym, leaving Ernie's corpse as his own, and make his escape using Ernie's club card. By accident, Ernie becomes involved with Sugar Pye and arouses Lucy's jealousy. After arranging for Ernie's death, Foots and Sugar Pye head for the airport; but Ernie escapes and gives chase. By using a fleet of cars and messengers on bicycles, all obtained through Diners' Club cards, Ernie creates a huge traffic jam that brings Foots and Sugar Pye to a halt. As a result of his heroism, Ernie is reunited with Lucy and promoted to the detective department of his agency.