Inside Out by Maria Snyder

The world is Inside and no one knows what's Outside. Is it Earth? Sky? It has to be something better, right? Trella hopes so. She's a scrub, forced to live to work in the ducts to clean the Inside for the Uppers. The Uppers live a better life than the Scrubs, don't they? (I kept thinking of Dr. Seuss's The Sneetches as I read this book) (And some other book that I couldn't remember the name of--was it Incarcenon?)

I enjoyed this read--it's dystopian and other worldly, yet intriguing. Trella/Sadie/Ella is resourceful and knows her way around a tool belt.