Cardinal Mercier protects the altar of his church from desecration when German forces invade the Belgian city of Louvain during World War I. Although the soldiers commit widespread atrocities, the cardinal does his best to protect the townspeople.

After a prologue where we are shown the backgrounds of Wilhelm II and Woodrow Wilson, we see the story of Conrad Le Brett from Alsace-Lorraine. Forced to fight for Germany Conrad, sees soldiers taking girls into a church to rape them and kills one who murders a baby. Shot in the encounter he is taken to a Brussels hospital run by nurse Edith Cavell where he falls in love with American nurse, Amy Gordon. After Edith Cavell assassination and the murder of Conrad’s sister Vilma by the evil Lieutenant Ober Conrad honors her dying request that he go to America and defend Alsace-Lorraine's reputation. Once there he convinces President Wilson that Alsatians should be allowed to enlist. Fighting with the "doughboys," Conrad kills Ober, and after the armistice, returns to Amy.

Leontine Maddern is a self-centered, unscrupulous actress, while her twin sister Leona is a serious and compassionate artist. Because of a scandal in which Leontine was involved, Leona uses her mother's maiden name of Rosalie Byrnes. Rosalie meets and falls in love with Lt. Gerald Cromwell and after they marry, Cromwell is sent overseas. His family, desiring that Gerald marry wealth, approaches Leontine and, mistaking her for Rosalie, offers to buy her off, and she accepts.

New York confidence man "Silk" Wilkins ingratiates himself with millionaire Lawrence Gray, knowing Gray’s wife and daughter Zelda were lost in a flood eighteen years earlier. After promising to find Gray's daughter, Silk returns to his boardinghouse, where he finds Alice Sheldon, broke and about to commit suicide. Silk convinces Alice to pose as Zelda Gray and then notifies Lawrence via a note placed in an almond shell that he has found the lost daughter. Lawrence treats Alice so kindly that when Silk demands payment from her on Christmas morning, she refuses. Lawrence, who has overheard the conversation, enters and laughingly reveals that he had known of the frame-up all along. Grateful to Silk for finding him a wife, Lawrence writes the confidence man a large check.