“Yes, sir,” replied the tall lad. “We wish to find out where Captain Ware may be found. We’re in his company, and——”

“Oh, yes. You were asking me that when I had to give instructions to these sentinels. If you’ll come with me I’ll take you to Captain Ware.”

He turned to go, but, before leaving, he looked again at the marine corps sentinels, one of whom stood on either side of the closed door of the mysterious cabin—at least it was mysterious to the three Motor Boys.

“Don’t forget!” the lieutenant cautioned. “No one is to enter that cabin—not even I—without a written order from Captain Munson.”

“Yes, sir,” was the answer in chorus, and, acknowledging the salutes of the sentries, the lieutenant strode away, followed by Ned, Bob, and Jerry.

“Has there been a mutiny, sir, or anything like that?” asked Ned of the lieutenant, at the same time nudging his two comrades to indicate that he was taking a chance in thus putting a question to a superior officer on a subject that might well be a forbidden one.

“A mutiny? What makes you think that?” was the quick retort.

“Oh, on account of what happened—the blowing up of the boiler, and all that. I thought maybe some one had been found planting a bomb in the engine room, sir, and——”

“You must have been doing quite a bit of thinking,” was the smiling comment of the young officer. “Be careful you don’t do too much. Or, at least, if you do, keep your thoughts to yourself.”

“Yes, sir,” assented Ned, and he knew then that his questions were not to be answered.