From the introduction:
A role-playing game of making your way in a world overrun by giant insects and social bigotry.
...
Hi, my name's Elab - Elab Smeth. I suppose you want to know about my life? Father said you would, so I'll do my best to describe what happens around here. We live in a house in Sanctuary. It's got lots of floors and it's very narrow, like all the houses here. I should probably tell you that Sanctuary is a city but it's not like the cities from way back in history because it's all built on the back of an enormous bug. Well, it's a louse really but we call them bugs. It walks around by itself and father says that's why our weather is so unpredictable. Sometimes they have to make it change direction though and father helps with that. He has to use Science.*