The Road to Hong Kong is the last of Bing Crosby and Bob Hope's Road pictures. Harry Turner (Bing Crosby) and Chester Babcock (Bob Hope) are flim-flam artists. Spy Diane (Joan Collins) mistakes Babcock for her contact and gives him the formula for rocket fuel stolen from Russia. A comedy of errors leads the con men from Calcutta to Tibet to Hong Kong to the first rocket to the Moon. Espionage, amnesia, and a race to be the first to the Moon combine in mischief and merriment.