Title rated 4.05 out of 5 stars, based on 21 ratings(21 ratings)
Book, 2013
Current format, Book, 2013, 1st omnibus ed, All copies in use.
Book, 2013
Current format, Book, 2013, 1st omnibus ed, All copies in use. Offered in 0 more formats
Follows two 11-year-old girls Robbi and Azure as their destinies collide when they must save their world, which is protected by giant towers called Ladders, from an alien invasion.
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