The acknowledgments to Deborah Baker’s crowded new book tell us how she came to write it. She had been looking for a way into a large subject, India and World War II. “Very few books had looked at the war and the decade that preceded it from the point of view of those for whom the Second World War meant finally getting out from under British rule.” A helpful librarian pointed her to the papers of John Bicknell Auden, elder brother of the poet Wystan Hugh and, as a distinguished geologist and cartographer, a figure of some interest in his