I read this book a number of years ago (11 is the number), and continue to remember how impressed I was by the author's ability to tell a compelling story based on what must be pretty scanty sources.
The life of the Marshall, from happy, laughing toddler to Marshall of England, and Regent, is perfectly amazing. It would make a great mini-series, in my opinion, if it were done well.
However, I doubt it would be done as well as this book.
This is a work of serious history, and at times it was tough chewing, but it worth the effort.