 Why was Altha away from the other Hairy People of her kind?
But here in the cavern world, thirty-seventh in the linked series of vast caves that underlie the waterless wastes of Mars, the reflected waves of sound were of little value. Here at least the air was thick enough to support life, and somewhere nearby the outlaws who smuggled their precious contraband water into the water-starved domes of North Mars lay hidden. Toward this barrier the spinner bore him, and Rolf was content to let it move in that direction—from the heights of the wall he could scout out the country beyond. "Down, Altha," a deeper voice rumbled from above, "it's one of the Enemy."
 The outlaws had turned the others against her.
 The outlaws had turned the others against her.  She had left their group in fear of attacks.  The outlaws had stolen her.  She had been lost from their group and never reconnected.