1923: Evangeline English and sister Lizzie head for China's ancient Silk Road city of Kashgar. Lizzie is on fire with her religious calling, but Eva has her green bicycle and a commission to write a lady cyclist's guide. Present-day London: A young woman finds a man sleeping outside her door and gives him a blanket and pillow. And when she inherits the contents of an unknown woman's apartment, the two embark on an unexpected journey together.

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