was at his side. In the black motor-boat two men stood with their
hands up. Alongside was a speedy-looking launch full of strapping big
men with firm jaws and the unmistakable stamp of detectives the world
over. Some of them were hauling on board the police launch Jack's
dripping figure, which clung fast to the life-preserver. Others kept the
men in the black launch covered with their pistols.

Half an hour later, when the passengers--all that is but Mr.
Rosenstein--had gone ashore (the diamond merchant had been asked by the
captain to remain), a little group was assembled in Captain Turner's
cabin. In the center of it stood Professor Dusenberry, alias Foxy Fred,
looking ever more meek and mild than usual. He had been seized and bound
by the two disguised firemen as he threw the life-preserver, but not in
time to prevent his getting it out of the port. Beside him, also
manacled, were the two men who had been in the motor-boat and who,
according to the Southampton police, formed a trio of the most daring
diamond thieves who ever operated.

"I think we may send for Mr. Rosenstein now," said Captain Turner with a
smile. "Only I hope that he is not subject to attacks of heart failure.
Ready," he said, turning to Jack, who stood side by side with Billy,
"take these and give them to Mr. Rosenstein with your compliments."

Jack blushed and hesitated.

"I'd,--I'd rather--sir--if you--don't mind----" he stammered.

"You may regard what I just said as an order if you like," said Captain
Turner, trying to look grim, while everybody else, but Jack and the
prisoners, smiled.

"You wanted to see me on important business, captain?" asked Mr.
Rosenstein, as he entered. "You will keep me as short a time as
possible, please. I must get to Scotland Yard, my diamonds----"

"Are right here in this boy's hand," said the captain, pushing Jack
forward.

"What! This is the fellow who took them?" thundered the diamond
merchant.

"No; this is the lad you have to thank for recovering them for you from
those three men yonder," said the captain.

"Professor Dusenberry!" exclaimed the diamond expert, throwing up his
hand.

"Or Foxy Fred," grinned one of the English detectives.

"Oh, my head, it goes round," exclaimed Mr. Rosenstein.

"This lad, with wonderful ingenuity, and finally courage, when he leaped
overboard to save your property, traced the guilty parties," went on the
captain, "and by wireless arranged for their capture."