Charles adores and constantly films his girlfriend, an ambitious professional ballerina, Mathilde Froustey. She eats, trains and sleeps while Charles acts as her assistant; he is fascinated by her physical form and her discipline. But while he realizes that her passion for dance is turning into a torment, Charles discovers as well his dependence on relationship with Mathilde, flawed and amplified by the lens of his camera. The things between them come to a critical point after moving to San Francisco, where Mathilde is pursuing a career as prima ballerina.
