The Progeny story continues as Paul, Jackson, and Hunter find themselves left behind in the wake of the solstice. The activation of the pyramid has led to some sinister changes that not even the Fallen are safe from, and as Henry's friends join the remnant of pure-blooded castaways in trying to understand their new predicament, a terrible discovery is made concerning Chadwick's doomsday theories and John's end of days theology. But can they follow their friends out of this hell in time to warn the world?