“I think that’s what is meant,” assented the pilot and engineer of the powerboat the boys had chartered. “They are suspicious of us, and mean to have a look in before allowing us to proceed.”

“But why should anybody be suspicious of four honest-looking boys out for a little fun?” demanded Josh. “We’ve met heaps of other people before now, and they acted just as nice as you please. I don’t understand it.”

“Well, you must remember,” admonished Jack, “that something terrible has happened since yesterday morning. Every military man in Germany and Austria has been on needles and pins about this war business ever since Serbia defied Francis Joseph and some of her adventurers murdered the heir apparent to the Austrian throne. And now that war has broken out, they are all eager to show their fidelity to their country.”

“But will you stop for them, Jack?” asked Josh.

“It would be foolish not to,” he was told, “because you can see it’s only a matter of ten minutes at most when they will have overhauled us. It pays to be courteous, especially, I’m told, when dealing with the military authorities over here. Besides, in war times they rule the roost.”

“I guess they do all the time,” muttered Josh; “but then you’re right about it, Jack. We must get ready to show them just who and what we are. If they’re sensible men they’ll let us go on down the river as we’ve planned.”

“And supposing they happen to be unreasonable men?” queried Buster.

“Oh, some of the dungeons may be large enough to hold you, perhaps,” laughed George; “but I can see your finish on a diet of bread and water, mostly water. You will waste away to a shadow before you get out, Buster.”

The other only gave him a scornful look, as much as to say he was not worrying any about that part of the game, for he knew he could rely on Jack to pull them all through safely.