I Served the King of England (2007)

Prague, Czechoslovakia, during the inter-war period. Jan Dítě, a young and clever waiter who wants to become a millionaire, comes to the conclusion that to achieve his ambitious goal he must be diligent, listen and observe as much as he can, be always discreet and use what he learns to his own advantage; but the turbulent tides of history will continually stand in his way.

Source: TMDb