Powder, a young orphaned girl from the rundown slums of Zaun, must navigate a dangerous web of magic, technology, magitech, retired and not-so-retirned revolutionaries, chembarons, and a wealthy city full of people who will stop at nothing to continue their lives of luxury even as the inhabitants of the Undercity choke on the pollution of their progress. And if all that weren't enough, there's the demons conjured by her own mind waiting in the wings to destroy everything she holds dear.