Sergeant Julie Porter didn’t ask to be reinstated,
 nor did she ask to be reunited with her old squad—a
   specialized unit inside of the already specialized
    Delta force. But the army needs Julie’s unique skills for
      a unique mission, and, unfortunately for her, they
        aren’t giving her a choice.

The job: rescue the civilian staff of a submarine base
     located two miles beneath the Atlantic ocean.

   It wasn’t meant to be a combat mission, but Julie
     and her team are ambushed the moment they arrive.
    Outnumbered and outgunned, they retreat into
   the Azores Fracture Zone, a network of endless caves
 that descends to the very core of the earth.

Cornered, with no hope of escape,
  Julie battles a Terran race never
   before encountered by mankind.