Even now, after more than 15 years, it is hard to see the invasion of Iraq through the cool, considered gaze of history. For too many people, the damage is still too palpable, and still unfolding. Most of the major players in that decision are still with us, and few of them are not haunted by it, in one way or another. Perhaps it's that combination, the passage of the years and the still unresolved trauma, that explains why so many protagonists opened up so fully for the first time to Robert Draper.

Draper's prodigious reporting has yielded scores of consequential new revelations, from the important to the merely absurd. As a whole, the book paints a vivid and indelible picture of a decision-making process that was fatally compromised by a combination of post-9/11 fear and paranoia, rank naïvete, craven groupthink, and a set of actors with idees fixes who gamed the process relentlessly. Everything was believed; nothing was true. The intelligence failure was comprehensive. Draper's fair-mindedness and deep understanding of the principal actors suffuse his account, as does a storytelling genius that is close to sorcery. There are no cheap shots here, which makes the ultimate conclusion all the more damning.