This book, written by Hermann Buhl, was largely re-written by his friend and editor Kurt Maix, at least according to Reinhold Messner, author of a climber's biography of Herman Buhl. This may be so, but I think this book conveys what Hermann Buhl wanted to say- after all he approved it.
While text such as "[my recollections of Nanga Parbat] are ... shining, alluring visions which sear one's heart and wipe out all memory of distress, worry, and disappointment" does not sound like his words, I think they well describe the sensation. And that is one of the key differences between this book and Messner's book, "Hermann Buhl- Climbing Without Compromise". This book conveys, as a detached writer would, the thoughts and feelings more than the exact words or technical details of Buhl's life. For those who prefer, or want additionally, to "hear" Buhl's own voice, and many more\technical details of his accomplishments, I recommend Messner's book.
FYI, the 1987 Movie "The Climb" only covers Buhl's climb of Nanga Parbat, but keeps fairly close to what is described here, and even "quotes" Buhl from this book.