as the title suggests it is a book on the theories about humankinds possibilities that some if not most of our make-up is down to aliens genetically manipualting our bodies and minds. i did have high hopes for the book but unfortunately it did not live up to its title, i am unsure whether the author thought we all have altzeimers or he needed to fill the book with something[i am refering to the "alien visitor gene"] which is quoted in just about every page SEVERAL TIMES, for instance i randomly picked 2 different pages and low and behold "alien visitor gene" at leat 3x per page, if you are searching as i am for our true origins this is not a book i would recommend, infact if i hear "alien visitor gene" again i shall scream