Eternity

"Multiple Nebula and Hugo Award winner Greg Bear returns to the Earth of his acclaimed novel Eon - a world decimated by nuclear death. Forty years on from Eon, Rhita Vaskayza seeks an Earth once again under threat from within and without. A certain faction is determined to re-open the Way, an endless corridor that spans universes. And humankind will discover just how much they have underestimated their ancient enemies."--Back cover.