L'Apache plot
Natalie Bourget, an American living in Paris, is married against her will to Jean Bourget, the brutal leader of the Parisian "Apache" underworld. At a cabaret, Jean forces Natalie to perform an Apache dance, during which Harrison Forbes and his American mistress, Helen Armstrong, notice Natalie's strong resemblance to Helen. The latter's life, under the corrupting influence of Forbes, has become so debauched that she is too ashamed to face her grandfather, Professor Armstrong, who has recently arrived from America to visit her.