"In a world where everyone is judged on their wealth and how many orbs they have, Pell, Logan, and Maddy can't keep up, no matter how hard they try. When they discover a mysterious note from Pell's long-lost uncle encouraging them to leave Fortress City, there's suddenly hope for a new start. They must hack their way into the system and navigate a brave escape into the unknown to help Pell's uncle fight for a cause that he believes in. The world outside their home proves to be more dangerous and difficult than they ever dreamed, but they press on and find themselves at an outpost for rebel forces. Will their knowledge and resources be enough to fortify the homestead against the elements and hostile invaders? As they struggle to stay alive, they begin to wonder what Uncle Colin and his fellow fighters are really up to, where their loyalty lies, and whether they are up for the greatest battle of their lives."--Back cover.

Ages 7-12.

Grades 2-7.