Ronald Colman, Douglas Fairbanks, Jr. and David Niven star in this swashbuckling adaptation of Anthony Hope's classic novel The Prisoner of Zenda. An Englishman (Colman) visiting a small Central European kingdom looks like a twin of that country's crown prince--who is his distant cousin. When the prince is drugged and then kidnapped in a plot to block his coronation, the tourist is enlisted to double as the prince--saving the prince and the country.