After serving in the trenches of World War I, Jean Diaz recoils with such horror that he renounces love and personal pleasure to immerse himself in scientific research, seeking a machine to prevent war. He thinks he has succeeded, but the government subverts his discovery, and Europe slides with seeming inevitability toward World War II. In desperation, Diaz summons the ghosts of the war dead from the graves and fields of France to give silent, accusing protest.
An unemployed maid is hired in a music hall to wash the floors. The whim of a screenwriter makes her go on stage in the most basic outfit. A revelation, success is at his doorstep! However, the young woman would prefer a virtuous life and a serious marriage to the easy but immoral existence offered to her by the world of entertainment.
Tino is a painter and occasionally a singer. When he has an opportunity to replace an absent singer, he becomes a sucess as a masqued singer, "Le chanteur masqué". Lisa is a typist who becomes a successful singer, also as a masqued singer, "La chanteuse masquée". Tino the painter falls in love for Lisa the typist, not knowing about her "masqued" activities. On the stage they are rivals.
About the assassination of Archduke Franz Ferdinand and the beginning of the First World War. Focuses on the relationship between a Serbian officer and his Austrian-born wife and their involvement in espionage between the countries.
Edwige, a rich American divorcee, goes to Morocco to look up an amazing pilot she once knew. The young woman's secretary, also an aviator, won't fly a plane because he was in a terrible accident. As he is in love with Edwige, the secretary does everything in his power to thwart her romance with the other pilot. He finally supplants his rival and wins the heart of his boss.
A wrongfully convicted man finds himself suspected of a crime committed in his prison.
