"Then, gentlemen," continued Admiral Timworth, his voice in tones of formal command, "you will not at any time mention this matter to any one unless so directed by me. I have had just one object in sending for you and giving you this order. For some time our Government has known that secret efforts are being made to discredit us with the allied powers of Europe. I feel rather certain that this fleet, while in the Mediterranean, will be closely watched by plotters serving one of the Central European powers, or else acting on their own account in the hope of being able to succeed and then claim reward from that government. Keep your eyes open. You may meet other spies and have reason to suspect them to be such. Do not be fooled by the apparent nationality of any man's name. A spy uses many names in his course around the world. Few international spies ever use their own names. The man in the green hat, who assaulted Mr. Cushing to-night, is one of the cleverest of his kind, and perhaps the most able with whom we shall have to contend. The fellow's name is supposed to be Emil Gortchky. At one time or another he has served as spy for nearly every government in Europe. He is a daring, dangerous, and wholly unscrupulous fellow. Ensigns Darrin and Dalzell, I sent for you in order to tell you these things, and to add that if, during this cruise, you run across the fellow at any point, you are to report the fact to me promptly. Of course you will understand that the seal of official secrecy attaches to all that I have said. That is all, gentlemen. Good evening."
Saluting, Ensigns Darrin and Dalzell promptly withdrew. They were still a good deal puzzled.
"I'll come to your quarters in a minute, if I may," murmured Danny Grin, as he reached the door of his own cabin.
"I want you to come," Dave answered dryly.
So, in another minute, Dan Dalzell, minus sword and gloves, bobbed into Dave's room.
"Now, what do you make out of all we have heard and seen?" breathed Dalzell tensely.
"Just what the admiral told us," answered Darrin.
"Nothing more?" pressed Dan.
Dave was thoughtful for a few moments before he replied:
"Danny, boy, we have our orders from the commander of the fleet. If we encounter Mr. Green Hat anywhere in the future, we are to report the fact. That is the extent of our instructions, and I think we shall do very well not to think too much about the matter, but to be ready, at all times, to follow our orders."