For millennia, they have stared through the invisible force separating their world from ours, and grew hungry. Now, they've found a way through. Darkness from their side swallows our skies, their diseases eat through our human bodies, leaving behind soulless husks ... and worse. Only two things can save us: a mysterious power locked in a small chest covered with undecipherable glyphs, and the seven year old girl it chose as its protector. A young Katie, trying to make sense of the grainy flashes from her past, escapes an organization determined to use her untapped special abilities to open a mysterious box she knows nothing about. With the Artifact in tow, she is hunted until rescued by a haunted, PTSD Vietnam vet Jonas Montgomery. Surviving the Viet Cong and many battles with the unwelcome visitors, Jonas finds his inner demons even more difficult. His only purpose in life-protect and train the girl to master what lies within her. The monsters plaguing our world increase. Jonas and Katie must take a stand, or the final chance to save Earth vanishes.