Before anything, I should declare a couple of interests here. I'm a former colleague of Oliver's in Baghdad, and I have also got my own book out about Iraq, which covers similar ground to his. Which, in a self-serving way, meant I was secretly hoping that this book wouldn't be much good. Alas, as anyone who's read Oliver's first book on Iraq, Black Knights, will testify, there was no chance of that. Red Zone is a superbly informative and engrossing read, be it for the Iraq anorak like myself, or for someone who knows nothing about the place and wants one single, easy-to-read book that will tell them all. Speaking as someone who's spent a lot of time there myself, I can also testify to the difficulty of the conditions under which Oliver was reporting. Most journalists pulled out when things started getting really dangerous in 2005 - Oliver, however, stuck it out, and as such has penned one of the very few accounts of the period when Iraq really went into its darkest hours.
Anyway, enough from me. Read it. There a lot of books about Iraq around, but this is one of the few very good ones (apart from mine of course....)