Wearing a period-appropriate porkpie hat, an oddly buttoned coat and a look of profound admiration, Welsh architect Jonathan Adams makes a well-suited tour guide for “Frank Lloyd Wright: The Man Who Built America,” and not just because he’s an architect himself. He’s also a critic. Wright, perhaps the most famous and prolific designer of buildings that America has ever known, led a life marked by scandal, adultery and even murder, but Mr. Adams’s stated intention is to get beyond the sensational and focus on the work—the whats, the hows and, just as important, the whys.