Return to sender

To answe an email:
The second book in the series Family of Dog: Return to Sender
Is connected to the first book The Harvest
But is not part 2 of the first book.
The first 3 books are a trilogy and the following 3 are associates
But not extensions.
The 3rd book Family of Dog: The Reich
Will finish the story of the origional 18
Characters from the 3 books
Thanks for asking!
Jake b