Covers: Open Library
The shadow cipherLaura Ruby
In an alternate history of New York, three kids try to solve a modern-world puzzle and complete a treasure hunt laid into the streets and buildings of the city.
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Pace: mediumLong
PuzzlesJuvenile fictionFriendshipBrothers and sistersFictionAdventure and adventurersChildren's fictionMystery and detective stories
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