"Very good; what is it?"

"You told me you knew Commander Hythe; go up to town to-morrow morning and warn him. Don't give him the name of your informant, merely say that Reno Durango is in England, and was seen in a Portsmouth train. That will be enough—he knows the character of the rogue. If we can nab the fellow on English soil that will save a lot of complications, for otherwise it won't end only in a rupture between Great Britain and Valderia. Valderia is only a pawn in the game as far as Durango is concerned. If he succeeds in obtaining the secret specifications and getting back to Zandovar he will, of course, apply his knowledge to the improvement of the Valderian submarines."

Whittinghame paused to wipe his face. The perspiration was slowly trickling down his forehead. He was labouring under intense mental strain. Dacres made no remark. He allowed his companion to take his time. Presently Whittinghame resumed.

"No, Valderia hardly counts in Durango's estimation. He is playing for higher stakes. Once he has succeeded in working the specifications what is there to prevent him from negotiating with some of the Great Powers? Should the secret pass into the hands of our avowed rivals, in a very short space of time they would possess a fleet of submarines of the 'Aphrodite' type, and our present unquestionable superiority would become a thing of the past."

"I see the drift of your argument," said Dacres. "In a way, Durango indirectly gains you the sympathy of the government, and your plans to rescue your brother will be facilitated."

"You've hit the right nail on the head, Dacres," observed Whittinghame. "Now let's see about turning in. It is half-past one."

Dacres was shown into a small but well-furnished bedroom. He noticed, with considerable surprise, that his small handbag for immediate use was placed on a chair by, the side of his bed.

"Hang it!" he exclaimed, as soon as he was left alone. "I clean forgot all about that bag. I must have dropped it when Callaghan and Co. tracked me in the wood. Well, I'm in luck—by Jove, I am! Here I am signed on for service in the mysterious airship—and already entrusted with an important mission. By the by, I wonder what that fellow Callaghan meant by saying, 'He's one of them!' I'll ask Whittinghame in the morning."

Even the momentous events of the day did not keep Dacres from sleeping. In less than ten minutes he was lost to the world in a sound, dreamless slumber.

At seven o'clock Dacres was awakened by a knock on the door, and in reply to his "All right" the man Williamson, who had acted as butler on the preceding evening, entered.