Les Bateliers de la Volga(1935)

In 1912, a Russian officer is wrongly accused of having stolen important papers. His only alibi being to have spent the night with the wife of a colonel, he allows himself to be condemned so as not to compromise the latter. He manages to escape and hides in the guise of a poor boatman. One day, the truth comes out, the colonel commits suicide and the lovers are finally reunited.