I loved this trilogy and its interesting how the “unknown infiltration” unfolds, its like a techno allegory to the communists. Definitely an enormous twist in it.
https://www.barnesandnoble.com/w/directive-51-john-barnes/1017489844
I would likely read it if I read fiction. I stopped quite a few years ago. Just too much going on! (does it have a good endning...?)
Should have added - DH reads fiction, went through a lot of the Rosenberg books.