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The Wizard of Dark Street (Oona Grate Mysteries) (edition 2011)
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Wikipedia in English
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In 1877, in an enchantment shop on the last of the Faerie roads linking New York City to the Land of the Fey, just after twelve-year-old Oona opts to relinquish her apprenticeship to her uncle, the Wizard, and become a detective, her uncle is stabbed, testing her skills.
(summary from another edition)