Edge of Reality by Charley Marsh

Sanity is madness put to good use. George Santayana

Sydney Waters stares out over the brittle, dry landscape three hundred feet below, sunken land that used to be Nebraska. How to cross four hundred miles of desert with a blind man and a dog?

Before Sydney can change course, the cliff edge breaks away, tumbling her blind companion down into the desert. Their only option now is a dark cave in the cliff that leads deep beneath the state, into the depleted Ogallala aquifer. Not an issue for a blind man, but uncomfortable and scary for Sydney.

Book Two of the Upheaval Series takes Sydney and her companions on an extraordinary and unexpected adventure in a world turned upside down.