Haunted by the horrific battle they barely escaped from and the deaths of their friends and allies, Jack Clark, Robert Rax and Justin Bryant attempt to travel across the state of Pennsylvania, following orders given long ago by the deceased Grassemer. Meanwhile, the parasite with human intelligence and its army prepare to eliminate the final vestiges of the rebel organization Walkrins and further worldwide chaos and annihilation through discrimination, paranoia and murder. The whereabouts still remain unknown of the only person who cared about Jack and who Jack cared for in return before he entered the conflict with the parasite: his mother, Susan Clark. Caught between the intricate motives of Rax and Justin and the mystery of his mother, Jack is once again thrust into the center of a conflict he feels powerless to change even though he may be the only one who can ultimately exert control.