"The Tiger's Wife," by Téa Obreht (Random House, 352 pp.) Here's the book the literati can't wait to get their hands on. Belgrade-born Téa Obreht, recently named one of the New Yorker's "20 writers under 40" to watch, offers this story, set in the present-day Balkans, of a young physician who plunges into her grandfather's mysterious past. (March)