The Ethical Engineer by Harry Harrison

Ijale stayed near Jason the next day, and took the next station in line when the endless _krenoj_ hunt began. Whenever it was possible he questioned her and before noon had extracted all of her meager knowledge of affairs beyond the barren coastal plain where they lived. The ocean was a mystery that produced edible animals, fish and an occasional human corpse. Ships could be seen from time to time offshore but nothing was known about them. On the other flank the territory was bounded by desert even more inhospitable than the one in which they scratched out their existence, a waste of lifeless sand, habitable only by the D'zertanoj and their mysterious _caroj_. These last could be animals -- or mechanical transportation of some kind, either was possible from Ijale's vague description. Ocean, coast and desert, these made up all of her world and she could conceive of nothing that might exist beyond.

Jason knew there was more, the crossbow was proof enough of that, and he had every intention of finding out where it came from. In order to do that he was going to have to change his slave status when the proper time came. He was developing a certain facility in dodging Ch'aka's heavy boot, the work was never hard and there was ample food. Being a slave left him with no responsibilities other than obeying orders and he had ample opportunity to discover what he could about this planet, so that when he finally did leave he would be as well prepared as was possible.