There seemed to the boy only one way in which he could attain the results sought for. He must catch the plotters "with the goods on," as the police say. He must catch them with explosives in their hands under the shadow of the dam! Ned knew that Harvey, Van Ellis, Gostel, and Itto were deep in the treacherous game, but he did not know how many others were taking part in it. He suspected that men high up in finance were back of the plot, and wanted to get the whole group.