The tables have turned on the mainland, and whilst the Resistance try to build a haven for refugees seeking safety, new dangers approach from overseas, with allegiances unknown.

As fear of the Descendants' retribution rises, Peridot, Euan, and their friends are left with no choice other than to seek the help of Vallaeartha as she battles desperately to control the darkness inside of her.

In this explosive conclusion to the Earthlings trilogy both loyalties and friendships are tested, as Peridot and Euan decide just how far they will go to fight for the right to freedom, for all kind.