Evicted from their own world by the humans that they have twice saved, Natalie Pierce and her few remaining kin float in the void of space inside the ship that has become their icy tomb. Rescue comes in the form of an alien spacecraft and Nat and her friends are soon facing adversaries that they have never encountered before. Their dwindling species is on the brink of extinction and it quickly becomes apparent that their new enemies would be only too happy to finish them off once and for all.