This is the second book in the Giants Series by James P. Hogan. It picks up right where Inherit the Stars left off: Humans knew about the alien race of Ganymedes and found one of their ships, but thought they had died out long ago. Then a ship full of them that had been lost in space time appeared suddenly. This book is all about the Ganymedes, their struggles, visit to Earth, the knowledge they shared about our origins, and their eventual departure to find their own kind.
This was a good book, but I preferred the third and first book in this series to the second one. Probably because I knew 80% of the plot from the third book, which made this one lose its magic. Don’t read them out of order like I did.
Like the other two books, this is a work of hard science fiction. Logical, researched, and plausible. My favorite kind of sci-fi!