"It seems to me that there is nothing more to say about this matter," Ned said. "We boys came to the Philippines to assist the government in unearthing this plot and bringing the leaders to punishment, and there seems to be nothing more to be done."

"But I don't quite understand it yet," Captain Curtis said. "How did you know that this box contained the treaty? How did you know that Keene was personating Lieutenant Carstens?"

"This man Keene," Ned laughed, "played his hand awkwardly. Through spies in the offices at Manila, doubtless, he learned that the treachery of the Filipinos at Godwin's island had been discovered. He knew that the government would look there first, and determined to block the investigation until he could accomplish what he had set out to do and get his blood money."

Keene frowned up from his chair at the boy, but said nothing. The senator's son smiled weakly and kept his eyes on the floor.

"Go on!" the Captain said, greatly interested.

"Lieutenant Rowe was detailed to investigate the matter, and ordered to the Godwin island. If the isle has another name I have never learned of the fact."

"It is called Penalty Island," smiled the Captain, "because the man sent there is supposed to be given the detail for some oversight of duty. However, in the case of Captain Godwin, I do not think this holds good."

"After the Lieutenant left for Penalty Island, then," Ned went on, "Keene discovered what was going on and feared that Tag and his fellows, if arrested, would snitch, as the boys have it. Then the messenger was sent after Rowe with more definite instructions. That is, he was given more positive instructions and sent out in haste. On the way to Penalty Island the instructions were stolen and another paper substituted.

"While the original order required Rowe to arrest Tag and his fellow conspirators, the false one required the Lieutenant to return at once to Manila. This would indeed have blocked the investigation and given Keene and his confederates time in which to complete their work of organizing the tribes.

"But the messenger knew what the papers he had been given contained, and when they were read by the Lieutenant—exactly opposite to the instructions given him—there was a pretty row. He informed Rowe of the substitution and advised him not to obey the orders delivered.