“That was decided upon a long time ago,” Van Ellis said.

“Before the New York complications arose,” Chester argued. “We did not know at that time what complications might result from the defection of one of our number. It is injudicious to go on now.”

“The date referred to was also set for action in New York,” Itto said.

“Yes, but the thing is inadvisable now, for Shaw has been warned.”

It was plain to Ned that he would have to get away from the old stone house and decide upon some effective means of meeting this emergency. He had work to do in New York as well as in Gatun. The drawing found in the bomb-chamber had told him that. Now this new information emphasized the demand for instant action.

There was no doubt in his mind that it was the purpose of the plotters to blow up the great dam on the next day, probably after nightfall. As has been said, he could thwart the plans of the traitors by communicating with the secret service men under Lieutenant Gordon, but that course would not be apt to bring about all the desired results. He wanted to arrest every man connected with the plot. Not only that; he wanted proof to convict every one of them.

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.

He thought he knew why Harvey, Van Ellis and some of the others were in the plot. He was quite certain that he did. But he was not so certain of the motives of Itto, the Japanese. They might never be revealed unless the game was checked at the right moment.

There was an air of insincerity about the Japanese which Ned did not like. It seemed to the boy that he was leading the others on—or trying to lead them on—in a sinister way. The impression was in the lad’s mind from the moment of his meeting Gostel that the two men, Itto and Gostel, were in the plot for some purpose of their own, a purpose which was not the accumulation of money, and which did not match the motives of the others.

About six o’clock Chester arose to his feet.