First, I should point out that this book is not new; it is a paperback edition of a book first published in 2011 as "In the Name of Glory", cleverly renamed to tie in with the new movie on substantially the same topic.
The book rather reads like a movie script, but it appears that that is purely coincidental, and the movie team appears not to have consulted the book in the writing of the actual movie script.
This is a very detailed look at the 1976 Grand Prix season, with particular emphasis, of course, on the rivalry between James Hunt and Niki Lauda. A considerable number of sources are listed in the Acknowledgements, and as a result we find out much about the two drivers' relationships with each other, with their families, their teammates, their team bosses and owners, their women and the press.
I lived through this period, and saw both men win races at Watkins Glen (Lauda in 1975 and Hunt in 1976). Compared with the information available in the motoring press back then, this book adds a lot of substance "between the lines" and I found some of it quite unexpected.
A bonus is the marvelous insert of color photos of the season by the noted photographer Rainer Schlegelmilch, and there is an appendix showing detailed race-by-race results, and a very detailed index.
Now, should you read the book before or after you see the movie? I'd say, both! That's what I did, and the two complement each other quite well. There may be more books released as a result of the movie, but this one is a great start.