It is a travel publication revealing the mysterious part of Tibet: Its sky burial, that a dead person is cut and chopped into pieces for the vultures' consumption. So that the dead will be flown up to the sky by the vultures to place that is nearer to their deities (god).
The second part of the book is on the route that a dead person has to pass through after death. Finally end up in reincarnation. The reincarnation may not be a rebirth of the human being. There are 6 channels to go for rebirth. Any moment one can rebirth as the son of his son, one can also rebirth as a monkey, or an ape (animal).
Believe it or not, this is the teaching of the esoteric religion of the Tibetans.
Have you seen people walking on the water to cross a lake? Look at the interesting image of the Tibetan nuns doing that.