In the near future, Earth has been conquered by a race of brutal alien machines known as the Mek, and an entire generation has grown up under their oppressive rule.

When Dakota Bregman, a rebellious young woman imprisoned in a Mek labor camp stumbles across a mysterious map that may hold the secret to humanity's liberation, she escapes and embarks on a dangerous odyssey across an alien-occupied America that leads her to an amazing discovery -- a long-lost prototype war machine known as a Gundog. Created by the last defenders of Earth, it has lain dormant for decades, hidden away. Waiting for someone to wake it up.

Now Dakota must confront a legacy she never knew she had, and embrace the warrior she was meant to be, facing down impossible odds and an overwhelmingly superior enemy in the hope of sparking a new flame of human resistance...