The Intra-Earth Chronicles: Book II: The Aswan Device

Noble sisters Sasha and Adrianne, along with their faithful companions-a satellite and a tiger-have defeated Tartarus, freeing the subterranean city of Mu from a dangerous tyrant. In gratitude, the council gifts them a powerful nuclear machine. Their mission is to journey to the surface with the machine and jump-start civilization. However, Tartarus, hiding like a snake in the grass, soon gains possession of the nuclear machine.

During his escape from the intra-earth, Tartarus disrupts Mu's ...