By chance I recently came across a first edition of this book in Oxfam.
I've read his Epic of Mount Everest, and also books about him. An interesting and complex man, who moved from war to peace.
It's a book of its time, 1936, and promotes the idea of the mountaineer as hero, which was the ethos then. Mallory is credited with more than he actually achieved.
Younghusband did develop a love for the Himalayan region, and the peoples and geography latter half is warm. ( And higher altitude areas I've walked in the region seem not much changed ).
A nice writer, but not as good as say Shipton, Tilman, or Smythe.
However for a flavour of the time, read it.