Extreme sub-zero temperatures suffocate the surface. Frozen structures of bygone eras span across massive ice-wastes. And the survivors closely guard any technology rediscovered within them. The only escape from the deadly climate is beneath the surface, but that doesn't mean it's safe. When an expedition into the far uncharted north goes terribly wrong, Keith Winterscar and his father get trapped together in a desperate fight for survival. Stumbling upon an ancient war of titanic scale, the two will need to set their differences aside while they struggle against gods, legends, and the secrets of the realm that lies below.