I love this book, and not because it's an easy and relaxing read (it's not) but because in my opinion, MacLean achieves greatness in writing it. Like any great book, it's about many things.
First, there's the story of the tragedy of the Mann Gulch fire, which killed 13 elite smoke jumpers in 1949. When MacLean began his research, there was much that was unknown (or lost) about the incident and even evidence that some details had been swept under the rug in order to protect the Forest Service during the lawsuits brought on by family of the deceased following the fire.
Really though, the book is equally about MacLean himself as he searches for the truth of what happened. Indeed, it would not be an exaggeration to say that the story is as much about MacLean and his search as it is about the Mann Gulch fire itself. The dead firefighters remain ghosts as characters in the story. It is only MacLean and those who enter the story as aids in his quest that come alive as characters on the page.
And on an even deeper level, the book is the story of a spiritual quest of an old man nearing the end of his life. I believe that it is a meditation on death. On the first page is the following quote of MacLean:
"As I get considerably beyond the biblical allotment of three score years and ten, I feel with increasing intensity that I can express my gratitude for still being around on the oxygen-side of the earth's crust only by NOT standing pat on what I have hitherto known and loved. While oxygen lasts, there are still new things to love, especially if compassion is a form of love."
So, at the tail end of his life he takes up the new hard work of writing. And what wonderful works he creates. For his last book (published after he died), he tells the story of the tragic deaths of the Mann Gulch smoke jumpers, not only to tell their story, but to face death: his own death as well as those of his loved ones who've gone before. The book ends with the following paragraph:
"I, an old man, have written this fire report. Among other things, it was important to me, as an exercise for old age, to enlarge my knowledge and spirit so I could accompany young men whose lives I might have lived on their way to death. I have climbed where they climbed, and in my time I have fought fire and inquired into its nature. In addition, I have lived to get a better understanding of myself and those close to me, many of them now dead. Perhaps it is not odd, at the end of this tragedy, where nothing much was left of the elite who came from the sky, but courage struggling for oxygen, that I have often found myself thinking of my wife on her brave and lonely way to death."
This is a great, moving book.