At the Manchester Art Gallery, Dr Bendor Grosvenor discovers a painting of a country gentleman from the 1770s which he believes has been misattributed to Nathaniel Dance. He feels sure it is in fact by the German painter Johann Zoffany, a favourite portraitist of the royal family under King George III. While the painting is restored, Bendor investigates the life of Zoffany - a chancer and adventurer who squandered his royal patronage through a series of predictable errors of judgement.