The serene love of farmer Josef Lajos and his wife, Maria, the youthful romance of their son, Paul, with Irma, and the betrothal of their servants, Peter and Lena, are suddenly interrupted by a "squall" and the arrival of a Gypsy camp near the farm.  The squall is in the person of Nubi, an exotic, amoral beauty who finds sanctuary with the Lajos family under the pretense that she is actually a Christian by birth.

Peter is the first to succumb to her charms, and he recklessly spends his savings on trinkets for her—and hours in the field with her.  Then she turns to Paul, a college student, who soon loses interest in his studies and in Irma.

Peter is fired when Nubi convinces Lajos that he has forced himself on her.  Then, Lajos himself submits to her charm.  When a veritable storm threatens, El Moro enters the house, declaring that he has been married to Nubi for four years and that she is the daughter of a chieftain.  As Nubi and her mocking laughter subside, the sun breaks through the clouds, and all is sweet and serene again.