History of the Mercury / Gemini / Apollo programs with lots of detail; also information regarding Russian efforts, capped by the Apollo-Soyuz joint mission. Shepard & Slayton are listed as authors but probably served as primary source for co-authors Jay Barbree and Howard Benedict, journalists who followed the space program and who are most likely the actual writers.
Interesting book, but they kind of treated the launching of the Sputnik as some kind of great tragedy. It's hard to imagine a time when we were so suspicious of the Russians that everything they do upsets us. It is hard to imagine, right?
Rather melodramatic, at least at the beginning. They describe the Mojave Desert (Edwards AFB) a "snake-infested expanse where sand and sun whiten the bones of long forgotten misadventures." I've spent a lot of time exploring the Mojave Desert (I don't get out of the car much when it's summer), and I don't recall seeing any snakes or bleached bones.