City at the End of Time

Multiple Hugo and Nebula award-winning author, Greg Bear is one of science fiction's most accomplished writers. Bold scientific speculation, riveting plots, and a fierce humanism reflected in characters who dare to dream of better worlds distinguish his work. Now Bear has written a mind-bendingly epic novel that may well be his masterpiece.Do you dream of a city at the end of time?In a time like the present, in a world that may or may not be our own, three young people--Ginny, Jack, and Daniel--dream of a doomed, decadent city of the distant future: the Kalpa. Ginny's and Jack's dreams overtake them without warning, leaving their bodies behind while carrying their consciousnesses forward, into the minds of two inhabitants of the Kalpa--a would-be warrior, Jebrassy, and an inquisitive explorer, Tiadba--who have been genetically retro-engineered to possess qualities of ancient humanity. As for Daniel: He dreams of an empty darkness--all that his future holds.But more than dreams link Ginny, Jack, and Daniel. They are fate-shifters, born with the ability to skip like stones across the surface of the fifth dimension, inhabiting alternate versions of themselves.

Synopsis from Open Library.