20 books — in reading order
Columbus Day
Craig Alanson
SpecOps
Paradise
Trouble on Paradise
Black Ops
Zero Hour
Mavericks
Renegades
Homefront
Armageddon
Valkyrie
Critical Mass
Brushfire
Breakaway
Fallout
Match Game
Failure Mode
Aftermath
Chuck Wendig
Task Force Hammer
Gateway
Frederik Pohl
