The book seems to read as a journal that was written up into a book. The majority of the book follows the author's thoughts and observations over a few significant years in her life, in pretty much chronological order. To a reader who's not paying attention, the whole thing might seem like an "I was there" account. However, one gets insight into how the author approaches her work, with careful observation, dispassionate analysis, and contemplation of the pieces to solve a larger puzzle. She also convincingly communicates an underlying enthusiasm and idealism that drew her into the work and maintained interest throughout. The narrative contains many anectodes about kinds of information that bones can reveal, and does a good job of communicating nightmarish conditions in a mass grave and speculation about the atrocities that created them, but concentrating on the interesting problems to be solved rather than going into gratuitous "gross-out" descriptions of the conditions or the violence. (They seem to have left her with a few nightmares, but whether she was having nightmares was never the point of the narrative.)
The writing style is good throughout the book, but the last chapter, which I expected to be some editorial "wrap-up" of the book, turned out to be a real thought-provoker. It's extremely bad form for a reviewer to discuss the ending of a book, and my overpromoting it may lead to dissapointment in some. However, she describes some bigger picture issues and generalities, conclusions about the world that comes from the commonalities of the various cases she worked on. Coming at the end of the book, you can see her conclusions arising out of the same piecing together and contemplation of results for society and political systems that she applied to individual corpses and grave sites. I suspect that these realizations may be one of the primary motivators for her writing the book; it's where the long string of anecdotes becomes a discussion of the world at large. I would like to have seen more of this discussion, but that may be for a later book. I simply trying to say here that it's worthwhile to finish the book.
I may be overly generous giving the book five stars, as it's not the "perfect" book, but I think it should be required reading in some circles. It's certainly one to hold your attention on an extended flight.