The Long Walk is supposedly true story of an escape from the Russian Gulags, by walking to India via Mongolia, the Gobi desert and the Himalayas. On the way, some of the escapes die, and they also get to view a pair of Abominable snowmen for a couple of hours.
While reading the book, l had my doubts about some of the episodes and the books validity generally, and on researching it a bit afterwards, it seems l am not the only one.
That's not to say the book isn't interesting, as a lot of it would no doubt have been based on true events, and probably other peoples tales. Slavomir Rawicz still tells an amazing (if somewhat repetitive) tale, and l know a lot more about the Mongols and the Russian / Polish hatred of each other than l did before.
Interesting, but certainly to be taken with a large pinch of salt.