Set against the backdrop of the shell crisis of 1915 at home and the Battle of Loos on the Western Front, two soldiers, one the manager of Grimlaw’s munitions factory are tested in their rivalry for Diana, a red cross nurse (Madeleine Carroll in her first film role).
Arsène Lupin, alias the Duke of Charmence, is a clever gentleman burglar. Detective Guerchard has vowed to bring Lupin to justice. Given a chance to escape when caught with the goods, Lupin gives up his freedom for the love of a good woman.