The team investigates four sketchbooks which may be the work of the young French master. Alain Brun is a French psychoanalyst who lives in Bordeaux. He was given the sketchbooks by his grandmother in the 1960s and she always maintained they were the work of Toulouse Lautrec. Alain sent them to the Lautrec committee to see if they could be authenticated. They came back saying that it was actually the work of Lautrec's tutor, Princeteau. However, Princeteau experts have disputed this - saying they are far too good. The team searches for evidence to see if they can irrefutably link these sketches to the young Lautrec and change the committee's mind.