After the harrowing events of Earthfall, twelve-year-old Sam and his fellow resistance members meet an enigmatic man named Mason who is slowly building an army to fight back against the invaders, the Voidborn.

Sam and the others join Mason and his soldiers on a mission to disable Voidborn technology in Tokyo. But Sam soon discovers that Mason has an agenda beyond what he has already admitted: He isn't content just to destroy the Voidborn's machines; he plans to destroy the Voidborn once and for all with a plan that will cost the lives of millions of innocent people.

But something is coming, something even worse than the Voidborn. Something very old and very evil. Something that might mean the end of them all.