I thought I knew how this book was going to end — tragically, of course, but I didn't know that Wharton would add an extra punch that hit me sideways and prevented the novel from being a typical tragic love story. At first I was only mildly impressed by the story and the characters, but that unexpected ending, which turned the whole book on its head, and the very useful introduction in the Wordsworth edition that I read prompted me to stamp it with an extra star.