Squeak-squeak(1963)

Léonard Monestier owns a large fortune, alas his wife Cynthia made a bad investment in a worthless oil concession. Far from letting this get him down, Léonard decides to find a sucker to buy this concession from him. Right on cue appears Antoine Brévin, a befuddled billionaire who is very interested in Léonard's beautiful daughter Patricia and would do anything to win her hand...