"Though it was Lieutenant Secor who really saved them for us," explained Blake, when the story of their adventure was being told.
"And I am glad the time has come when Lieutenant Secor can appear in his true light," said Captain Black. "Even I suspected him, and he lost many friends who will come back to him, now that he risked all to serve his country in a rôle seldom honored—that of getting secret intelligence from the enemy."
For that is what the French lieutenant had been doing. Even while he was in the United States, where the boys first met him, he had been playing that part.
"But I assure you," he said to Blake and the others, "that the destruction of your films by my auto was an accident. When I found you believed it done purposely I let it go that way, as it helped me play my part the better. Also, I had to act in a manner to make you believe I was a friend of Labenstein. But that was all a part."
And it had not been an easy part for the French officer to play. He had, in ways of his own, come to suspect Labenstein, who went under various names, sometimes that of Karl Kooder. This man, who held forged citizenship papers of the United States, was a German spy and had done much to aid the Kaiser. But he accepted Lieutenant Secor as a co-worker, on the latter's representation that he, too, was a friend of Germany, or rather, as the Frenchman made Labenstein think, was willing to become so for a sum of money. So the two seemingly worked together.
"And it was thus you knew us," said the lieutenant to the boys. "Labenstein, to use one of his names, had orders to make all the trouble he could for you when you reached France, and to prevent your getting any pictures, if possible. Of course he could not do that, but he tried, even to the extent of writing a false note in London that caused your arrest. I had, seemingly, to help him, but all the while I was endeavoring to find out where the leak was on our side that enabled him to profit. And I found out. The leak will be stopped.
"I even seemed to join Labenstein in signaling the submarine, though that night, had he really succeeded in calling her with your light, I would have killed him where he stood. However, the depth charge solved that question.
"I had to escape from the ship with him to lull his suspicions against me. Then I went into the German ranks with him, being thought a deserter! That was hard for me, but I had my duty to perform.
"The rest you know. It was by a mere chance that Labenstein, when I was with him, came upon your films after the gas attack. He thought to profit personally from selling them, which is why he did not turn them over at once to his superiors. Ever since then he has been trying to dispose of them to enrich himself. And I have been trying to find a way to get them back to you without betraying myself and my mission.
"At last chance favored me. The big air attack came just after I had secured all the information I wanted. I was about to go back to my comrades and arrange for the capture of Labenstein if I could. He still had the films and was about to sell them to another German—a traitor like himself.