In 1840 Turner painted the masterpiece "Clouds and Water". Charlotte tries to fathom his loose style, with thick blobs. Englishman and cellist Dominic Seldis comes by to blare his cello with praise for this "British Rembrandt". Michel discovers that the painting has undergone precarious treatment, but wonders how. In search of the answers the team visits the Tate Britain and gather on a windy English cliff. An episode in which an iron, a chalk rock at Margate and a jar of beeswax play a leading role.