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The kids give chase down a twisty spiral stairway and find themselves in a strange and magical world below. Most surprising of all, it seems that their great-grandfather, who was an inventor and puzzle maker, was there before them – and he's left some unfinished business.
Now it's up to Em and Navin to figure out how to set things right and save their mother's life!
Paperback
First published January 1, 2008








