Four years after extraterrestrials kidnapped everyone on Earth they deemed to be worthy--leaving behind the unintelligent, the old, and disabled--young Sam has found herself to be a pawn in an alien civil war. She and her new friend, Mia, however, think they have found a way to resist their captors and keep their humanity. Meanwhile on Earth, Sam's twin, Wyatt, has launched a resistance army, a ragtag group of the elderly, old, young, and disabled--and Wyatt has a plan to bring the aliens down.