Title rated 4.1 out of 5 stars, based on 181 ratings(181 ratings)
Book, 2015
Current format, Book, 2015, , Available .
Book, 2015
Current format, Book, 2015, , Available . Offered in 0 more formats
"Two middle-grade kids take a shortcut home from school and discover what looks like fuzzy mud but is actually a substance with the potential to wreak havoc on the entire world"--Provided by publisher.
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