"They're still at it," exclaimed Merritt, as the flag continued its eccentric rises and falls; "what's next, I wonder?"

Dash—dash—dash—dash, spelled out the flag.

"That means 'to'," declared Rob.

"Yes, and there comes 'night'," exclaimed Merritt a moment later. "And now they've stopped. Let's see what message we've caught."

"Short and sweet," laughed Rob. "I guess we came in at the tail end of their confab. All we've got is 'Ready to-night'."

"Well, isn't that something?" demanded Merritt. "At all events it's a complete sentence and tells us that somebody will be ready for something to-night."

"Right you are, and that 'somebody' is to be Barton, I'll bet a doughnut."

"But ready for what?"

"That remains to be seen. I've always thought Barton would bear watching. I'm certain of it now, and if the submarine isn't mixed up in this tangle somewhere, call me a Chinaman."

"Are you going to tell the ensign about this?"