This is an outstanding book describing and explaining the technology of the Apollo space program. I've read dozens and dozens of books on the Apollo-era manned space program (including Mercury and Gemini), and when I started reading this, I didn't really expect to learn much I hadn't already encountered. I was very wrong about that.
Mr. Woods provides an exacting level of detail, sure to make sure you learn something you didn't know. A representative example is his discussion of why Apollo 8 leapfrogged earth-orbital testing and went directly to the Moon in 1968. It's well known that the lunar module (LM) was not yet ready for manned spaceflight, and most texts say pretty much that. Here's Woods's statement (pp 36-37):
Apollo 8 had originally been planned as the D-mission, a test of the entire Apollo system including a lunar module in low Earth orbit, on the assumption that Apollo 7 would successfully carry out the C-mission. However, the first man-capable LM was not ready for flight owing to a litany of problems: stress fractures had appeared in some of its structural components; the type of wiring used on the intended spacecraft was prone to breakage; and the engine for the ascent stage was prone to combustion instability. Bereft of a LM, managers were unwilling to simply repeat Apollo 7, so they altered the mission sequence and brought the deep-space goals of the E-mission forward, but without a lander.
This is typical of the level of detail that Woods artfully supplies: instead of just saying the LM wasn't ready, he describes why: stress fractures, wiring breakage and ascent stage instability. This is the only book I've ever read that provided this level of detail, and it's worth noting that Woods does so without turning the passage into a drudgerous recitation of facts. This is typical of his approach throughout the book.
There's a lot I learned in this book, that I'd never encountered elsewhere. I never realized the Saturn stages had retro rockets and ullage rockets; the retros used on a dropped stage to pull it away from the still-moving rocket; and the ullage rockets (in the early Saturns) giving a light boost to settle the propellants in their tanks before igniting the upper stages; or that the stages were separated with explosive cord that actually cut through the metal, rather than explosive bolts as I'd always assumed. Also, the details of the Hohmann transfer orbit, a two-burn maneuver used to change from a lower orbit to a higher one; I'm pretty surprised I'd not encountered that one before.
And errors? I usually spot a small number of errors in just about every book of this nature, but not in this book. I thought I'd caught one: Woods refers to the VAB, the huge building in which the Saturn stages were vertically assembled, as the "Vehicle Assembly Building," and my understanding was that that name did not come about until the 1980s and the Shuttle program; during the Apollo program, I thought, it was called the "Vertical Assembly Building." But when I attempted to verify that, I found that that I was wrong: yes, it was indeed the Vertical Assembly Building when it was first built, but the rename to Vehicle Assembly Building occurred in 1965, well before the first Apollo flight; even then, NASA had its eyes on post-Apollo operations.
Woods is British (making his level of knowledge and detail about this US space program even more admirable), so it's a bit disconcerting to have British spelling used throughout, but one quickly adapts to that. The only area of improvement I would suggest deals in his use of the metric system. As he is British, use of metric is understandable, and he addresses this in the preface of the book. However, given that the text of the book is interspersed with references to 1960s NASA documents and quotes, all of which use the English system of feet, pounds, etc., it would have been nice to have also seen the English units added parenthetically.
But this is a quibble. The bottom line is that this is an extraordinary and excellent book for anyone interested in the details of the Apollo program, and I recommend it with no reservations whatsoever.