Seduced and abandoned by the caddish Louis La Farge shepherdess Marie Beaupre is cast out of the village and forced to survive in the mountains alone. Driven mad she becomes known as “the witch woman” until hypnotist Dr. Cochefort and his friend Delaunay encounter her while on a hunting trip, take her to Paris, and effectuate a cure at which time she becomes heir to Delaunay's fortune. All seems clear sailing until Marie is introduced to Louis's twin brother Maurice and mistaking him for Louis sets forth on a plan for revenge.