This is the last (in a long series) of T. Good's books. It is a very good update. Mr Good includes here some cases he did not investigate before, like for instance the Mass Contact case in Italy. What's interesting in Mr Good works is that he has really an open mind and that sees the data and people for himself. This new work open quite new avenues into direct contacts between humans and beings from other worlds, especially human-looking ones. In this respect, I feel it is a very interesting and authoritative work. The title, though, may seem a little misleading, since some persons might feel disappointed because of unfulfilled expectations. But it is really what T Good thinks (Earth - An Alien Enterprise), and data gathered in the book speak for themselves. However, as usual in these books, it more a collection of interesting cases than a thesis.