Under the Mountain: Into the Outside, Book 3 (Unabridged‪)‬

Isabella and her new family have been captured and imprisoned in the underground city of Mt. Weather. They and other captive mutants face certain death cleaning lethal radiation zones outside unless Dr. Rosario's cure can save them.

But can Isabella's brother Luke and the Mt. Weather rebels convince enough of the army that the mutants are worth saving? Without their help, the mutants are doomed.