Dan Snow sets out to discover whether art can really sustain and inform our memories and knowledge of the past. He retraces the career of Nottingham-born artist Arthur Spooner (1873 - 1962) whose paintings are scattered across the region and faithfully record events and people as he saw them. But just how reliable is his work? In a specialist disability college situated in the middle of Sherwood Forest, Dan discovers a pair of virtually unknown Spooners that appear to tell a very specific story about a celebrated duchess, shed light on the role of the aristocracy during the First World War and hold a clue about the origins of the college. Dan sets out to solve the mystery and test the artist's historical accuracy.