e the command to put about and return.

Slowly the little craft came about and started back toward Bantry Bay.
Behind them now, the _Glasgow_, safe at last, steamed rapidly away,
bound for the distant port of New York, and "home," said Frank to Jack.

"Do you wish you were on her," asked his chum curiously.

"No," replied Frank, slowly, "unless I was sure I would find my father
waiting for me when I reached there. However, I am having a pretty good
time on this side and I know that I shall return safely some day."

_The Hawk_, last in line, made her way back slowly.

An hour after the lights of the _Glasgow_ had faded from view, Frank,
glancing forward, was unable to make out the distant light of a single
of the other motorboats. He called Lord Hastings' attention to this
fact.

"Is that so?" exclaimed his commander in some surprise. "I had no idea
we had been going so slowly. We'll step out a bit."

He issued a command, and the speed of _The Hawk_ increased. But still,
after an hour, they had failed to come up with the others.

"Well, it's nothing to worry about I guess. We know the way back as well
as the others; besides, there is no particular hurry."

Accordingly _The Hawk_ continued at rather slow speed.

Half an hour later, Frank, forward, made out a dark hulk lying low in
the water a short distance ahead. He immediately called Lord Hastings'
attention to the object.

The latter acted quickly.

"Extinguish all lights quickly," he called sharply.

The order was obeyed, and at a second command, _The Hawk_ was slowed
down so that she was barely moving.

"What's the matter, sir?" exclaimed Jack, in great surprise.

"Matter is that there is a submarine dead ahead of us," was his
commander's reply.

"You mean that dark object there?"

"Yes."

"And are we going to sink her, sir?" asked Jack.

"We'll have a try at it," was the reply. "In this darkness we can go
very close without fear of being seen, _The Hawk_ is so small."

Fifty yards from the submarine, which lay quietly in the water, _The
Hawk_ came to a stop and the forward gun was made ready for action.

"Funny there isn't some one on deck," muttered Frank.

"By Jove! So it is," declared Lord Hastings. "Must be something wrong. I
wonder what?"

"I have it, sir," declared Frank. "It's one of the vessels that those
other motorboats--the ones we sunk--were to have reported to."

"I believe Frank is right," agreed Jack. "It probably comes to