“few minutes later, Zac steered the Searcher down between two mountains. A valley stretched out below them, covered in a blanket of white mist. ‘Our next target is IRIS’s power core,’ Grandpa explained. ‘It’s hidden down there in an old, broken-down castle.’ Zac looked out the window for some sign of Leon. Grandpa had asked Zac’s brother to meet them on the way here. But there wasn’t any sign of Leon’s flying MicroLab. Zac guided the”