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The Wizard of Dark Street (Oona Grate Mysteries) (edition 2011)
The Wizard of Dark Street (An Oona Crate Mystery) by Shawn Thomas Odyssey
References to this work on external resources.
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)