This book is mostly about photography's place in the world, how it relates to other arts, and the long-lasting question of whether it can be conceived of as an art. Also, there are good discussions about whether photography is or is not evidence and whether it is or is not a truthful representation. In other words, this is mostly a book about the philosophy of photography, if you will. And, while short, it's dense and full of discussion.
The book's largest flaw is that it glosses over digital photography until the end. For a book published in 2006, this may or may not be acceptable. But, then when the treatment of digital photography does come in a final chapter, that chapter is too simplified at best and verges on incorrect at worst. For example, at one point, the author indicates that it is impossible to detect tampering with an image. While it's true that digital technologies do make wholesale manipulation difficult to detect with the human eye, that's long been the case in photography. In the realm of the digital, there is a lot of work that has gone into algorithms that can detect manipulation. Also, if one is really interested in verifying that a photo is authentic for news purposes, Canon and Nikon (and maybe others) do have software solutions that rely on cryptographic signing to authenticate an image was made with a particular camera at a particular time and whether it was modified. With an attached GPS feed, even location data can be verified.
Still, even with a few glaring issues which seem to be the result of revising the text over time, the book is a thought provoking read. I'd have given 4 stars except for the poor treatment of digital technology in photography.
One further note for the Kindle edition, the font used is inconsistent and not as pleasant to read as the default font used by most of the other Kindle books I've read so far. There are several places where letters are broken. It's simply not as pleasant a read as other books from a font perspective.