I've followed the Soviet space program for more than fifty years, and this is the best book ever written on the Buran shuttle -- and the best book ever LIKELY to BE written.
The authors had access so wide and so deep into the project that the narrative they created probably tells the reader a lot more -- and in useful context -- than even the program's managers knew themselves as they were working on it. The authors can do that because of their own decades of investigation into the shadows of Soviet space mysteries (I've been privileged to be their colleague on many of those quests), and their superbly-honed skills at analysis, organization, and explanation.
This book is more than a look backwards -- it's a lesson in how big space projects can go astray, even if they achieve technological success, because their fundamental rationale for existing was faulty from the start. All space program managers around the world -- Russia, China, the US, Japan, Europe, etc -- NEED these lessons from such 'bad examples' as Buran, and this book makes it possible.