1939 was a watershed year. The Great Depression was barely over; economics, politics, and culture braced for war. There was a lull before the storm and Hollywood, as if expecting to be judged by posterity, produced a portfolio of masterpieces. No year before or since has yielded so many beloved works of cinematic art: The Hunchback of Notre Dame, Gunga Din, Only Angels Have Wings, Destry Rides Again, Beau Geste, Wuthering Heights, The Wizard of...