I recommend "The Echoing Green" by Joshua Prager. It tells the untold story about the shot heard around the world, and how the Giants were stealing their opponents signals and signaling them to the batter. Bobby actually admitted this to Branca and apologized just a few years ago. I admire Bobby for many reasons. May he rest in peace.
http://www.amazon.com/Echoing-Green-...p/0375421548#_