L'Île des veuves.

During World War I, in Flanders, Berry and Trent were in love with the same girl, Yvonne. During a battle in the Widow's Island sector, Trent is wounded and abandoned by Berry. Trent being reported missing, Berry now has a clear path to marry Yvonne. Two decades later, Yvonne incidentally meets a tourist guide in the former combat zone region who looks fiendishly like - Trent.