Simply put; an awful book.
The synopsis presents this book as invesitgative research into whether fallen angels came to earth in corporeal form and corrupted mankind. Personally, I am very much into the likes Graham Hancock and Robert Bauval, and whilst I don't always agree with their dedecutions, I enjoy their work.
The book purports to use ancient texts to support it's argument... but the lack of any method or scientific rigour, and instead using unabated religious zeal, led me to give this up within the first fifty pages. A very biased and blinkered author.
Honestly, there are better books out there.