The Wings of the Dove, on Amazon, has an absurdly low rating, much like most of James's other novels. To all readers seriously interested in purchasing a James novel for the first time, I urge you not to be frightened by all the reviews that say something like, "exhausting," "overrated," "flaccid," "unbearable," and so on. It's the eternal critique of James; the readers who find James "unbearable" are simply not meant to read James. They will forever bear a grudge against him, and we can do nothing about that.
If you're approaching James for the first time, know that "The Ambassadors," "The Wings of the Dove," and "The Golden Bowl," often referred to as the novels of his "Major" (late) phase, are his greatest works, but the style of these novels, while full of rewards, is challenging. There's no doubt about that. Use Amazon's "look inside" feature and read a few pages; if you're intrigued, by all means, buy the book. If you're turned off, don't buy the book, at least right now. If you're mystified but still interested, consider reading the books in a different order.
It may be a bad idea to start off your reading of James with "The Wings of the Dove" or "The Golden Bowl." These are works of an artistic genius who has been meditating on some of the same themes, ethical dilemmas, situations, and the representation of changing consciousness for a lifetime. As such, they are prose texts of great complexity, and readers need to expect that a novel written by a reader, writer and thinker of age 60 is rather different from the product of a man of age 35 or 40. Age often brings complexity: by the time we come to W.B. Yeats's last poems, for example, we are simply expected to know a few things about Yeats: Maud Gonne, say, some of his key symbols and poetic forms. I remember hearing Helen Vendler lecture on Yeats's late "Among School Children," she says: "this is a poem of a man, 60, who expects us to tolerate the well-stocked furniture of a 60 year-old mind." "The Wings of the Dove" is a novel of a man, 60, who expects us to tolerate the thorny intellectual and representational crises that have haunted his 60 year-old mind.
If you are interested in reading "The Wings of the Dove," which is a gorgeous novel of severe choice, eros, tragedy and liberation, but you are afraid to jump into the late James, I suggest you train yourself on some of James's earlier texts that are just as great but are a bit more accessible. "The Portrait of a Lady" (1881, written 20 years before "Wings"), is a great place to start; in fact, some consider it James's finest novel. "The American" (1877), though rather imperfect, is also worth looking into. Or you might read some of James's stories - "Daisy Miller: A Study" (1878) - is a thematic precursor of many of his larger novels. (Note: "The Turn of the Screw," (1898) while also great, is great for different reasons. It is a ghost story, and in this phase of his career, James was intrigued by the supernatural. So, while it is a great read, it is not in any obvious way a precursor to something like "The Wings of the Dove").
This is just some advice for new readers who aren't ready to plunge right away along with Kate Croy into the depth of a moral miasma. But if you feel ready, by all means, plunge! It is not for me to explain why you should read "Wings," but if questions of betrayal, knowledge, deception, innocence, experience, desire and transcendence interest you in works of fiction, then, what a lark, what a plunge is this text!