This is a shockingly poor book, full of grammatical errors, incoherent ramblings, and inexcusable sources (like Wikipedia!). The author makes points that don't logically connect to one another, and regularly digresses into irrelevant subjects that are often difficult to follow, and seem to be there just to remind the reader of his credentials as an engineer.
The general premise of the book is that the Anunnaki of Mesopotamian mythology are actually aliens (building on the work of Zecharia Sitchin, who is described almost like a prophet within these pages), who visited the earth many years ago, and are basically secretly behind everything of note that's ever happened on the planet (because humans couldn't possibly have achieved anything by themselves). All the mythology and religions of mankind are reflections of the stories of Mesopotamia, which are not myths but historical events that should be taken literally. Wait, hang on a second... Not quite "literally", because the author (and all those who follow in Sitchin's footprints) have taken a literal interpretation of Mesopotamian mythology and suffused it with a very imaginative science fiction pretext worthy of L. Ron Hubbard. I've read English translations of these myths from the same source that the author cites (the rather excellent Oxford World's Classics Myths from Mesopotamia, translated by Stephanie Dalley), and I don't remember seeing anything about spaceships and flying saucers in there. But the very nature of mythology is that they are so open and easy to reinterpret however you want that I could propose the argument that these stories were actually talking about the Flying Spaghetti Monster if I wanted to, so I would never say that anybody is "wrong" for interpreting mythology in their own way. But, of course, any interpretation that doesn't conform to the worldview of Sitchin is wrong because he is, apparently, the only person who ever properly translated the ancient cuneiform tablets. The lecturers at the Ancient Near Eastern Studies department of my university (SOAS, University of London), who train the next generation of scholars in this field, would disagree with Mr. Sitchin, as would any curator at the British Museum, but we just need to take this author's word for it that their rigorous academic training is wrong and that he is right.
I wouldn't be so harsh on this book if it were reasonably well written. After all, the interpretations presented within this book on Mesopotamian mythology are no more farfetched than many of the interpretations that people who follow "normal" religions have of their mythology. Well, this isn't quite a "religion" yet, but all we need is for someone to build a church for Lord Enki (hasn't that already happened in South Korea?) and it will be. However, this book is woefully written and downright embarrassing. Amazon.com is full of reviews from people who believe this theory who criticise this piece of rubbish, so it isn't just me.