In the autumn of 1940, two icons of American culture met in Sun Valley, Idaho--writer Ernest Hemingway and actor Gary Cooper. Although Hem was known as brash, larger-than-life and hard-drinking and Coop as courteous, non-confrontational and taciturn, the two became good friends. And though they would see each other over the years in Hollywood, Cuba, New York and Paris, it was to Idaho they always returned. Here they hunted together, waded through...