A few months ago, a highly regarded expert in medieval manuscripts approached me with a request to become involved in a then-secret mission. Sandra Hindman is a scholar who—through her Les Enluminures galleries in Paris, Chicago, and New York—aids and guides libraries, institutions, and private individuals in acquiring some of the best and last-surviving products of medieval illuminators and their workshops. To this end, she has issued a series of meticulously researched catalogues describing and interpreting such manuscripts. Although it’s unusual for her to devote one of these catalogues to a single manuscript, this one, Hindman felt, was worthy of the attention. Would I have a look?