Beyond Infinity — Gregory Benford

“A taut adventure that examines humanity's role in steering the fate of the universe [by] one of today's foremost writers of hard SF.” 

In Beyond Infinity, physicist and Nebula Award-winning author Gregory Benford takes his scientific imagination to the outer limits of time itself. Set more than a billion years in the future, it begins with a young woman named Cley, one of the few genetically unaltered humans left on Earth.

Cley yearns to escape the rigid, timeless world she knows. So she flees in the company of an intelligent beast wise beyond recognition. But there are mysterious forces at work among the planets that she never foresaw. Alien agencies have learned to span parallel universes, ones that lie only a millimeter away but are invisible to humankind. 

When these beings confront the travelers, an epic struggle beyond imagining begins.