“They fringe the beach,” Bob explained.

“Good. With reasonable care we ought to be able to make our way undiscovered close enough to see what is going on, supposing a landing such as I have in mind is taking place.”

“There’s armed guards on the Brownell place nowadays,” interjected Tom Barnum, to whom Jack had given a brief explanation of things. “Maybe, them fellers have sentries posted.”

“Well, we’ll have to exercise caution when we get close to the Cove,” said Captain Folsom. “And now, if we are all ready, let us start. Every second’s delay is so much time lost. They’ll be working fast. If we are to gain any information, we must hasten about it.”

“Righto,” said Bob, striding off. “And just let me get my hands on the sneak that tried to burn the airplane,” he added, vindictively. “I’ll give that gentleman a remembrance or two of the occasion.”

The others fell in, and with long strides started making their way along the sand left hard-packed by the receding tide, under the moonlight.

Bob set a terrific pace but, fortunately, all members of the party were young men and accustomed to physical exercise, and none found it any hardship 91 to keep up with their pacemaker. On the contrary, three at least enjoyed the expedition and found their spirits uplifted by the zest of this unexpected adventure undertaken at 2 o’clock in the morning.

When they drew near the first of the two horns enclosing the little bay known as Starfish Cove, Bob pulled up, and the others came to a halt around him.

“Just ahead there,” said Bob, pointing, and addressing Captain Folsom, “lies our destination. I expect it would not be wise to make our way any farther along the sands.”

Captain Folsom nodded.