One of the things that has puzzled me the most in my years of serious mystery reading is why there are relatively few standout books geared specifically for middle grade and young adult readers.

'A Spy in the House', the first of Y. S. Lee's 'The Agency' novels, is pure confection, an historical romp through England at the height of The Great Stink that imagines a secret spy ring for women tucked away where few notice but powerful factions clamor for their services.

With only one novel to her credit, Anna Jarzab can't quite be classified in Werlin country, but 'All Unquiet Things' is a big step in that direction.

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