It's time for the annual London to Brighton antique car rally, and Alan McKim and Ambrose Claverhouse are not going to let their friendship stop them from trying to humiliate each other. Along the way, some old jealousies are kindled to the point where the two men decide to have a "friendly" wager on who will be the first back to London. Once the competitive juices get all fired up, however, it quickly becomes a nasty, hotly-contested affair. Ambrose's companion must suffer through her "maiden voyage" on the rally, while Mrs. McKim, on the other hand, is a long-time sufferer of her husband's obsession.