In 19th century China, Snow Flower and Lily are two girls matched by laotong - a lifelong relationship that is said to be more intimate than a relationship between husband and wife, or parent and child - but both are kept isolated by their respective families. In order to talk to each other, the girls invent a secret language - called "nu shu" - and write it between the folds of a fan, which they share with each other.

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