The River

"Seven years ago, Del Hawthorne's father and friends disappeared near the Nathanni River and were presumed dead. When one of the missing men stumbles onto the University grounds, alive but barely recognizable and aging before her eyes. Gatherin a group of volunteers, Del travels to the Nahanni River to rescue her father. There, she finds a secret underground river that plunges her into a technologically advanced world of nonobots and painful serums. — paraphrased form the back cover copy to the second paperback printing.