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4-639 Clues series.
Good-hearted siblings Amy and Dan continue their globetrotting quest for the clues that will unlock the power of their historically über-powerful family. The series still pushes credulity past the tipping point, but these installments introduce new developments (heretofore cartoonish competitors reveal hints of humanity; the sibs' stalwart nanny becomes suspicious; clues to their parents' death surface) that rejuvenate the foundering plots. Review covers these 39 Clues titles: The Black Circle and In Too Deep.