Having read Into The Silence two years ago, I am now listening to it on audiobook ... Terrific.
In his last letter to his wife Ruth he wrote ... "It is 50 to 1 against us, but we'll have a whack yet and do ourselves proud."
http://www.nytimes.com/2011/12/04/books/review/into-the-silence-the-great-war-mallory-and-the-conquest-of-everest-by-wade-davis-book-review.html?_r=0