A Face Like Glass by Frances Hardinge

In a subterranean city famed for its artisans who distill and manufacture flavors, scents and even emotions as marketable wares, an orphan girl whose face cannot be coaxed into the expected expressions finds herself apprenticed to the city's strange industries and caught up in lethal court and guild intrigues; her unmaskable, candid face and sharp intelligence force her to navigate secrets about how the city's power depends on controlling appearances, to forge unlikely alliances, and to outwit those who would exploit the city’s uncanny crafts for darker ends.

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