Second to the Mixed Up Files of Mrs. Basil E. Frankweiler by E.L. Konigsburg and also her The Outcasts of 19 Schuyler Place. They aren't SF/F but her books would be good for reluctant readers.
I'll think about this one and get back to you with more suggestions!
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branchandroot
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Date: 2009-03-09 12:11 am (UTC)I'll think about this one and get back to you with more suggestions!