This is definitely the most interesting, thought-provoking Catholic history book I have ever read. Its theme, in a nutshell, is that the Church is troubled by many and varied ideologies, events, and trends throughout history, but the worst conundrums often work themselves out in a way that no one can foresee, sometimes quite suddenly. (That is why this book as the unusual title that it does.)
This book has two parts. The first 40 percent of the book is about Church history from the early Church until 1960. From the start it was clear that this was not the typical overview of Church history one usually finds; rather, it focused on examination and analysis of time periods that relate to modern times, either for reasons of turbulence, or the lack thereof. Far from being review for me, it was unique and thought-provoking analysis. Sire does write as a man of Faith, but he doesn't try to whitewash difficulties, but examines them in detail. Every few pages contained fresh insights or considerations I had never thought of before. (Because of this, a reader should be familiar with basic Church history before reading this book. It expects you know the general events already.)
The next 60% are about the lead-up to Vatican II, the Council itself, and its aftermath. This is also brilliant and interesting historical analysis. His analysis and criticism are careful, direct and (I think) usually accurate. They are also just plain interesting. He wants to really dig into what happened, not give facile party lines. Sometimes this leads him to render judgment on people and their decisions, but sometimes he gives mitigating factors based on their motivations or points of view at the time.
I have two criticisms of the book. First, I wish that he footnoted more. There are footnotes, but they are certainly not exhaustive, and I would have loved to consult his sources to learn more.
He is also, very occasionally, overly hyperbolic. There are a few sentences where his usually reserved and witty British delivery turn into exaggerations. This is extremely rare, though, and I only remember this in the section about the Vatican II document on the priesthood. I think his criticisms on the topic are valid, but the conclusions he reaches go a little too far.
I highly recommend this book. Even when I didn't agree or wasn't convinced by what Sire was saying, the book gave me new ideas and perspectives to consider. It provides superb context for what we are going on in the Church right now, and is also compelling in it own right.