After decades of oblivion in the deposits of the Florentine Galleries, considered by scholars to be irretrievably lost, Gentile da Fabriano's Polyptych of the Intercession re-emerges. The Opificio delle Pietre Dure and the Restoration Laboratories of Florence are attempting the "impossible" feat. A group of restorers, art historians, and scientific experts tell the story of the progressive recovery of the work, through daily research and difficult restoration.