Fly by Night by Frances Hardinge

Mosca Mye is considered strange in her village, mostly because of her ability to read. When the strange con artist Eponymous Klent comes into town, throwing fancy words around like water and filling everyone's head with stories, Mosca sees her chance. She frees him from the stocks and together they flee to the great city of Mandelion! There Mosca meets the Duke's sister Lady Tamarind and gets caught up in a web of illegal printing presses, twin queens, floating coffee houses, and homicidal geese. Will she be able to sort out the strings and make everything right before she loses her head?

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