André de Kerdec, a young lawyer buys an old parchment in an antique shop and discovers that a treasure is hidden in the bedroom of Artémise, an old maid who owns a manor. He manages to be hired as her chauffeur by Artémise and sets about looking for the treasure. During this time, he falls in love with Lucie, the old spinster`s niece. But the trouble is that Artémise develops a crush on André...!