Hannah and her friends have been warned about the danger lurking ourside of their secret refuge from the alien invaders who devastated Earth years before. The teenagers' leaders have raised them in the Latter-day Saint faith, teaching them to trust in God, but when McKenzie and her rebellious boyfriend Jeremy decide to run away, Hannah and Derek follow, determined to bring their friends home. Once outside, the four teens soon realize they cannot return to the refuge without endangering everyone there. Captured, enslaved, and separated, Hannah, Derek, and McKenzie each learn the unique role they must play in liberating the earth. The friends must battle with android soldiers and attach vessels, and face their own inner struggles to overcome the invaders. After all, not even an alien invasion can stop the work of God.