I bought this as a Christmas present for my partner, and thought I'd just read a chapter first. I then had to lock myself away to read the rest. I can't see how anyone could dislike such a charming novel (except those envious of Craig's prodigious talent). Yes, the characters are all middle-class Americans and Brits - but aren't they in most fiction? That doesn't make them smug, as someone has claimed - in fact, at several points I wanted to kick Polly, the self-sacrificing wife and mother, in the pants for being so depressed, or did until the real reasons for it were revealed.
As other reviewers have said, the novel is a version of A Midsummer Night's Dream, with the rude mechanicals left out (a pity - I was looking forward to some extra comedy there). Apart from switching the sex of all Shakespeare's characters (it is the women who pursue the men, for instance)its real touch of brilliance lies in making the three children, bored silly by holidaying in Tuscany, into the fairies. The clash between the children's world and the adults is beautifully described, but underneath it the novel asks questions about the imagination and its freedom to upset daily life, and about the choices people make when in love that are serious and worth asking. I didn't think British writers wrote novels as satisfying and intelligently witty as this any more.