297 pages hardcover 2007

fiction middle grade science fiction adventurous lighthearted medium-paced

299 pages hardcover 2009

fiction middle grade science fiction informative lighthearted medium-paced

287 pages hardcover 2011

fiction middle grade science fiction adventurous medium-paced

352 pages hardcover 2014

fiction childrens middle grade science fiction adventurous medium-paced

336 pages hardcover 2016

fiction middle grade science fiction adventurous mysterious medium-paced

416 pages hardcover 2018

fiction middle grade science fiction adventurous challenging slow-paced