20 Tucker led her through a maze of hallways, ever further from the hangar deck, going down every flight of stairs they passed until at last the final passage ended in an open doorway. And beyond that open doorway was an immense natural cavern. Turning around, Scout could see the back wall of the compound rising all the way up to the ceiling far above. The cavern must be put to some use, fully lit as it was. A variety of wheeled vehicles were stored here, although she saw no tire tracks in the sandy cavern floor. If there was a way out that could be driven through, it didn’t look like the rebels were using it. “How did you get all of this here?” Scout asked. “Train,” Tucker said. “Runs from Jakart, past our old compound, past here, and all the way to the next mountain where the gun is