L'Eau du Nil.

Wirsoq, who belongs to the type of cosmopolitan financier, gets into his power a young French aristocrat, Arthur de Sorgepois, and insists that the boy's sister should marry him. The girl is in love with a young artist, Pierre Levannier, who secretly returns her affection, but does not declare himself at this critical moment because he is not rich enough to support a wife.