Years ago, aliens came to Earth and provided humans with advanced technology that could power the entire planet. There are four giant towers, called Ladders, that stretch high into space that must be maintained in order to keep the power on. And because of the small tubes and tight spaces, the job requires children. Only the best kids get accepted to Laddertop Academy, and from them only a few get selected to actually participate in going up to the Laddertop stations.
Azure and Robbi are eleven-year-old girls who are best friends, and both are selected into the Academy, where there are weird tests and training to determine who will be selected for the journey to the stations. Who are the aliens, why did they disappear, and why specifically do they need children for their work?
Reviewed by kate the librarian.
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