So many twists and turns with Six and Z! Love the characters and the story they make! Love the accuracy and knowledge of geography, geopolitics, weapons, and technology by this amazing author! None better since Vince Flynn! Thank you for another awesome book….now to start on Sierra Six!

I enjoyed this story. There were a number of plot twists and story lines that kept the book fast paced and exciting.

Awesome read.

Action, intrigue, action, suspense, action, well crafted, action

There is nothing like The Gray Man, Sierra Six! When I finish a book, can hardly wait to start the next one!

Great read moved fast

Rapid paced action

A much better read then the previous book. A real return to action for the reader and the characters. Nice work!

Great read. Action around every corner.

Love this book series and these characters!!!