The Long Walk: Factual Account of Yeti from WWII, or Fabrication?

Today while visiting a thrift store in my area in search of odd books, I found a copy of The Long Walk by Slavomir Rawicz. The book itself doesn’t focus on the anomalous, instead dealing primarily with the story of Rawicz, who at the time had been a prisoner who escaped with a small group of men from a Soviet prison camp in 1941. In order to make it to freedom, those who survived the ordeal were forced to travel out of Siberia and across China, the Gobi Desert, Tibet, finally traversing the Himilayas into British India.