Kids playact war in the backyard and the adults decide to show them a documentary about World War 1.
Belphégor deals with a series of mysterious appearances by a masked-and-robed figure in the Louvre; a security guard is murdered, and a later police trap is foiled when the phantom—“Belphégor” (the name of a legendary demon)—uses knock-out gas. Journalist Jacques Bellegarde of “Le Petit Parisien” (the real-life newspaper which published the original story in serial installments), investigates, and eventually discovers famous detective Chantecoq and his vivacious daughter Colette are also on the case.
Marguerite is a courtesan in Paris. She falls deeply in love with a young man of promise, Armand Duval. When Armand's father begs her not to ruin his hope of a career and position by marrying Armand, she acquiesces and leaves her lover. However, when poverty and terminal illness overwhelm her, Marguerite discovers that Armand has not lost his love for her.
A young English lord, who has been excavating in Egypt, finds a mummy of a beautiful Egyptian princess, more than 5,000 years old. So well has the Egyptian embalmer done his work that the face is perfect in all its beauty, and the susceptible young man falls deeply in love with this belle of old Egypt, takes the mummy home to his estate in England and there it occupies his whole mind, to the exclusion of all else. Even the proposed visit of a beautiful American girl does not arouse his interest.