I purchased this book hoping to read a new analysis of Vatican II; my hope was modestly realized.
The book describes an interesting alliance of four groups of theologically and geographically diverse bishops on three issues which came before the Council along with a rather technical sociological analysis of the bishops' voting patterns. The author's thesis posits why "liberal" bishops triumphed in many matters over the "conservative" bishops.
The book did not help me get to know the personalities of the influential bishops at the Council or much of the backroom politics - though in fairness, the title doesn't promise it will.
There were occasional subtle inaccuracies of "church facts" e.g. calling St. Peter's Basilica "St. Peter's Cathedral," and the author's unqualified assertion that Vatican II elminated the Latin/Tridentine mass (interesting in light of Benedict XVI's recent motu proprio).
Overall an enlightening, but rather technical read.