Desperately searching for the other Concentrators that are fatally disrupting Earth's orbit, Eleanor and her companions are labeled as terrorists by G.E.T. forces that would eliminate all but a few select people.

Can humanity survive on a new world? On Eos, the last survivors of the Long Winter face their greatest challenge yet--and race to unravel the deepest secrets of the grid. The last survivors of the human race escaped a ruined Earth. Their new homeworld--Eos--seemed perfect at first. Warm. Hospitable. Safe from the grid. But everything isn't as it seems. The first colony of settlers--from the Carthage--have disappeared. Their settlement is still there,...

As Ayla and Jondalar travel across Ice Age Europe they encounter savage enemies and brave friends in their search for a place they can call home

The reader's choices determine whether three friends will survive after being mysteriously transported back in time to when the climate was cold and saber-toothed cats and wooly mammoths roamed the land.

Still trying to stop the evil Dr. Kron-Tox, Andrew, his cousin Judy, Thudd the robot, and Beeper find Uncle Al in the Ice Age, where they encounter prehistoric animals, birds, and people.

In the brutal Ice Age caused by the ancient Jemen war, many archaic human species, including Denisovans and Homo erectus, hover on the verge of extinction. There seems no way out, until the greatest Neanderthal holy man, Trogon, has a vision. Legends say the truce that ended the old war left one hostage in the hands of the victorious rebels: the god-like Jemen leader, known as the Old Woman of the Mountain. According to Trogon's vision, only one person...