In his packed-with-photos “The Golden Age of Indianapolis Theaters” (Quarry Books), former Indy newsman Howard Caldwell does a fine job of staying on the fine line between reference book and popular history. I could have used more detailed geography—I spent far too much time trying to figure out where some of the long-gone theaters were—but I thoroughly enjoyed being introduced to a period I knew little about. And guest appearances by the likes of Dick Powell add to its pleasures. Side note: Caldwell tells of how Eugene O’Neill’s nine-act “Strange Interlude” sold out the balcony and gallery of the English Theater back in the 1920s. Where are those risk-taking audiences today? More on the book here.