Shadows of the Deep King

From the publishers blurb:

Once upon a time, this was Dwarf land, with all their stone houses and secret tunnels. But then, they vanished, like they were never here. And we came along, making our homes in this old, empty place. Some of their buildings were still standing, but they were like empty shells, missing all the cool stuff they used to have.

But guess what? Folks say the dwarves are coming back. We've only heard stories about them, never actually seen one for real. But our grandparents, they tell us if a dwarf's shadow touches you, you gotta spit on the ground to keep away bad luck.