Summer, Edith Wharton wrote to Gaillard Lapsley, "is known to its author and her familars as the Hot Ethan." One of the first American novels to deal frankly with a young woman's sexual awakening, it was a publishing sensation when it appeared in 1917, praised by Joseph Conrad, Howard Sturgis, and Percy Lubbock, and favorably compared to Madame Bovary. Like its predecessor, Ethan Frome, it is set in the Berkshires, but the season...