1893. When aspiring French artist Pierre Bonnard (Macaigne) - a protégé of Claude Monet - meets Marthe de Méligny (de ), he has no idea that this self-proclaimed aristocrat will become the cornerstone of his life and work. From this moment, though she appears in over a third of his work, she's more than just a muse; together over five decades, the couple will explore creative fulfillment, love and jealousies that challenge the standards of the time, as the film interrogates the great mystery around their relationship.

Provost’s vision for this material is clear and concise; what may appear as a traditional of its subjects soon moves beyond conventions and evolves into something much more resonant and profound.