Before his death, Leonardo da Vinci set about his final masterpiece: he sketched the outlines of a sumptuous palace for Romorantin, even imagining that it would become the new capital of France. But although the construction work did begin, the palace was never completed. In the footsteps of Leonardo da Vinci, this movie takes us to London, Milan and Romorantine, where consultation with the greatest specialists allows for a ludicrous challenge: to reconstruct in computer-generated images what should have been the ideal palace of the great Italian genius.