S bastien is fifteen years old and already versed in the medicinal arts when he meets the young nobleman Balthazar de Cr on, whose life he saves after the latter is thrown from a horse. De Cr on, struck by the boy's beauty as much by his talents as a healer, orders S bastien to his manor some months later so he can instruct him in the ways of the court, hoping thus to install him as Louis XV's surgeon. His motives, however, are clouded by his lust...