The invasion didn't come from the skies, it came from beneath our feet; an alien ecosystem threatening to devour the earth and all its occupants. Jeri and her little sister Cake leave their mountain stronghold in search of a safe haven called 'the island'. Their journey takes them across thousands of miles of murderous creatures and madmen; a hellish landscape where everything wants to kill you. But, for Jeri the real enemy might be right at her side because her sister was born after the invasion began, and could very well be an alien herself. Their quest pits sisterhood against the will to survive at all costs.