The Arasmith Certainty Principle by Russ Colson

A geology grad student with a spiritual bent and a mystic from the Pleistocene risk their growing affection to solve a science mystery and save the world from a powerful demagogue. Adult/YA SF adventure with a touch of romance–Cygnus SF 1st Place Category Winner–“Enjoyable adventure that will leave readers thinking about important concepts even past the end of the book.”-Long and Short Reviews