Leonardo da Vinci, Milan's Renaissance ideal, is tasked with painting The Last Supper but struggles to find the perfect person to model as Christ. Vittorio Dessa, a young farmer, is eventually spotted, plucked from farm life and placed at the heart of an alien world of art and science, aristocracy, politics and intrigue. Initially shocked, Vittorio gradually adjusts to the artist's exuberant manner and ambitious ideas, and after some hesitation, resolves to pursue his own ambitions and venture beyond the safety of the city walls. Thus encouraged, Vittorio's fortunes boom, but ill-equipped to deal with the transformation, his life slowly lapses into one of paranoia, jealousy and eventually murder. The strands of the story climax at Leonardo's very public reveal of The Last Supper painting.