Gertrude Chandler Warner
15) The mystery girl
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While helping run Jerry Taylor's general store, the Alden children investigate his mysterious employee Nancy.
Author
Formats
Description
Jessie wants her science fair project to make a difference. So when she gets the chance to test a local creek for pollution, she can't wait to get started. But when things start going wrong with her experiment, Jessie and her siblings don't just have an experiment to investigate, they have a mystery to solve!