Patricia A. McKillip 
Moon and the Face [EPUB ebook] 

Riverworld was a planet of Eden whose people possessed the power of dreaming the future. Kyreol, daughter of a Healer, pierced the vision veil to discover the ultimate truth — that her home world unknowingly hosted the way station of a vast interstellar civilisation.An evil star shone on Kyreol’s first mission as an interplanetary agent. Her ship fell out of space, cracking on a lonely, mysterious moon. Rising from its endless plains was the white city — awesome, abandoned, eons-dead — a silent world of secret wonders.Only her prophetic dreams linked Kyroel to Riverworld, but she was hopelessly marooned light-years away. And she was not alone…