"The Greatest Hoax on Earth" is a young earth creationist book, written by Jonathan Sarfati. The author is the leading light of the CMI, an international creationist ministry. Sarfati is also the author of "Refuting Evolution", apparently a bestseller.
Personally, I'm not a creationist, but my main objection to this book would be that it's very similar to "Refuting Evolution", frankly boring and in need of better editing. "The Greatest Hoax on Earth" is written in the form of a response to Richard Dawkins' book "The Greatest Show on Earth", in itself a badly edited and rambling tome. It's almost as if the two books deserve each other...
If you absolutely want to know more about young earth creationism, I would rather recommend "Refuting Evolution".
PS. Humans are descended from other fronkeys. Just so you know. :P