The Unknown Masterpiece recap

Young Nicolas Poussin meets the celebrated old painter Frenhofer in the studio of Frans Porbus. Frenhofer brilliantly criticizes and retouches Porbus's canvas, then speaks of Catherine Lescault, the portrait he has labored over in secret for ten years and regards as a living woman. He insists that one final model is needed but refuses to expose his own work. Poussin persuades his beloved Gillette to pose for Frenhofer in exchange for a sight of the hidden masterpiece, wounding her trust in him. Once the sitting is complete, Frenhofer admits Poussin and Porbus. They see only a chaos of accumulated paint with one exquisitely preserved foot, while Frenhofer sees a perfect figure. Hearing their dismay destroys his conviction. He sends them away, burns his paintings, and dies that night, leaving Poussin's artistic ambition and his relationship with Gillette morally damaged.

In seventeenth-century Paris, the young and impoverished Nicolas Poussin waits outside the studio of the established painter Frans Porbus. He follows an imposing old man inside and learns that the visitor is Frenhofer, a revered master and pupil of Mabuse. Frenhofer subjects Porbus's painting to a searching critique: its parts are skillful, he says, but they do not yet create the presence of a living person. With a few confident additions he transforms the work, astonishing Poussin. Frenhofer then describes the private canvas he has worked on for ten years, a portrait of the courtesan Catherine Lescault. He speaks of her less as an image than as a woman he has brought to life and refuses to let other painters inspect her. He believes, however, that comparison with a perfectly beautiful living model might help him settle his last doubts. Poussin thinks of Gillette, the young woman who loves him, and begins to see her beauty as the possible price of admission to Frenhofer's secret.

Poussin asks Gillette to pose for Frenhofer, promising that the exchange will let him see the master's hidden work. She reluctantly agrees out of love for Poussin, while recognizing that his willingness to offer her gaze and body to another man exposes the selfishness in his artistic ambition. At Frenhofer's studio, the old painter first resists the bargain but accepts Gillette as the model he needs. After the sitting he announces that Catherine Lescault is finished and allows Porbus and Poussin into the locked room. The visitors search the canvas and find no coherent figure beneath its dense accumulation of colors, apart from one livingly precise foot at the edge of the ruin. Frenhofer continues to praise details only he can perceive, then overhears their conclusion that the canvas contains nothing. Forced to see the gap between his vision and the object before him, he sends everyone away in despair. Gillette turns from Poussin, wounded by what he has chosen. By the following morning Frenhofer has burned all his paintings and died, destroying both the failed masterpiece and the rest of his life's work.

After Gillette serves as the model Frenhofer believes he needs, he declares Catherine Lescault complete and permits Porbus and Poussin to see the work. They find almost the entire canvas buried beneath confused layers of color and paint; only a single beautifully rendered foot remains intelligible. Frenhofer initially continues to speak as if the painted woman were alive, but he overhears the younger men saying that they can see nothing. Their reaction breaks through his certainty. He looks again, recognizes that the masterpiece exists only in his own vision, and drives them away. Gillette also understands that Poussin was willing to sacrifice her feelings to his ambition. The next morning, Porbus learns that Frenhofer has burned his paintings and died during the night.