Three decades after fleeing the devastation of their home world, the Helghast refugees coexist with their human cousins on the planet Vekta. A great wall dividing the societies has made this unthinkable feat possible, though the scars left by centuries of war are not so easily forgotten...

As Shadow Marshal Lucas Kellan, you're sworn to defend your human brethren; but when a flashpoint brings you face to face with the mysterious and deadly female Helghast soldier Echo, you'll discover a new side to this ancient conflict, and to yourself.