l we eat?"

"I want a limburger cheese sandwich," announced Jimmie. "I'd like it to
be on rye bread with plenty of mustard. Then with a couple of cups of
real old Dutch coffee I guess I'd last until noon."

"By noon we'll be out on the North Sea, I hope," stated Harry.

"You don't get onto the North Sea direct from Amsterdam!" scorned Jack.
"You have to go through some sort of lake or bay first!"

"Leave it to Mr. Mackinder here!" protested Harry.

"Your friend is right, Harry," smiled Mackinder, thus appealed to.
"Amsterdam is on the Zuider Zee. If we get a vessel at that place we will
pass northward through that water, thence between some of the Friesian
Islands into the North Sea. From that point it is but a short distance to
my destination. Any port in England will be suitable for my purpose."

"Nix on England for mine!" declared Jimmie. "I'm for the little old
United States every time. We are neutral there without having to think
about it. I'm about done with war. I've seen enough!"

"Too much is plenty, as the Dutchman says," put in Harry. "But about this
Amsterdam place, now. Do you know the town, Mr. Mackinder?"

"Indeed I do!" was the reply. "I have been there many times."

"Then perhaps you'd be good enough to give us a little help. You see,
we're strangers there and since we've lost our airship we're almost
helpless. We're not accustomed to finding our way about where the
inhabitants don't speak English. Besides, we're not provided with a map."

"I shall be delighted to help you in any way possible," continued the
man. "I think that if you follow me you'll have little trouble."

The lads gladly availed themselves of this offer, and shortly after their
arrival at the city they found themselves in a room plainly but
comfortably furnished. From their windows they could see the shipping in
the harbor. Before them a busy street teemed with traffic.

Watching the strange sights below the boys were startled to hear:

"I'll trouble you now for the 'U-13' package!"

Wheeling quickly they were frightened to observe that Mackinder had them
covered with a revolver. His look was stern and determined.

CHAPTER III

THE MAN WITH THE SCAR

"What package is it you want?" inquired Ned in amazement as he saw that
Mackinder evidently intended to enforce his demand at all costs.

"I shall countenance no delay!" spoke the man sharply. "You may step to
your luggage there and produce that package instantly