From IMDB:

Two con men try to settle their rivalry by betting on who can swindle a young American heiress out of fifty thousand dollars first.

From Kanopy and Amazon Prime you can stream this 35 year old comedy which lasts 1 hour and 50 minutes.

Needless to say, if one of the actors is Steve Martin, we are probably talking about a comedy.  Michael Caine is the perfect matchup against Martin.

Old but still lots of fun and plot surprises.