Director Ivan Passer and screenwriter Peter Stone adapted Paul Erdman's novel concerning a group of con men who arrive in Switzerland and end up conning each other. Michael Caine stars as Doc Fletcher, a lackey for gangster Joe Fiore (Martin Balsam), who is sent to Switzerland to purchase a bank for his boss. Prince di Siracusa (Louis Jourdan) is aiding Doc in his purchase but is working on his own scam. They both meet Shireen Firdausi (Stephane Audran) and Agha Firdausi (David Warner), who are working on their own deal concerning an Iranian silver mine. Also arriving in town is Donald Luckman (Tom Smothers) and his wife Debbie (Cybil Shepherd), sent by banker Henry Foreman (Joss Ackland) to buy a bank as a front for Charles Cook (Charles D. Gray), a billionaire who is looking for a way to disguise his profits. With all these schemers in tow, various confidence games play out and characters switch alliances and obligations, while some wind up in jail.