"Eh? What?" the man turned sharply about.

Curlie was silent again.

"It's funny about them wireless rigs for a plane," said the keeper at last. "You git your ground by hanging a wire seventy-five er a hundred feet down from the plane, then you get ground just the same as if the wire was dragging through the sea, don't matter whether you're up a hundred miles or five thousand. Strange stuff, this radio."

"Yes," said Curlie, "it is. By the way," he exclaimed suddenly, "do you know about this new Packard-Prentiss equipment?"

"Yes, sir; was tryin' one out only yesterday. Fine thing."

"Reliable?"

"Absolutely."

"Know where I can get one?"

"Over at Dorrotey's sea-goods store on the dock. He's got one er two for sale."

"Thanks." He and Joe started away.

"Next place is Dock No. 3. The _Kittlewake_, the Ardmore yacht, is tied up over there. Unless I miss my guess we'll be off to sea in less than two hours," said Curlie to Joe. "Speed's the word now. Those two young dreamers have gotten away by plane. We've got to stand by in the _Kittlewake_ or they'll never be seen again. I don't propose to allow the sea to rob me of my first important offender against the laws of the air."

"By the way," said Joe, "where is Gladys Ardmore? I haven't seen her since we left New York."

"I don't know and I'm glad I don't," said Curlie. "She let fall a remark in the dining car that I didn't like. She said she thought she'd go along with us on this trip. A five hundred mile trip straight out to sea in a fifty-foot pleasure yacht with a fifteen-foot beam, is no sort of trip for a girl. I was afraid she'd try to insist. That would have caused a scene, for unless I miss my guess she's the determined sort like her father."

"It's queer she gave us up so quickly."

"Yes, but I'm glad she did."

Suddenly Curlie started. As they rounded a corner he caught sight of a trim, slender figure. This girl had been standing in the light of a shop window. Now she dodged inside.

"Huh!" he grunted. "Thought that looked like her, but of course it couldn't be. Some ship captain's daughter probably."

They arrived on board the _Kittlewake_ just as the captain, a red-faced old British salt, and the engineer, a silent man who was fully as slim and wiry of build as Curlie himself, were finishing lunch.

"Pardon me," said Curlie, "but did you get Mr. Ardmore's wire?"

"You're this wireless man, Curlie Carson?" asked the captain.

"Yes."

"'Is message is 'ere; came this morning."

"Then you're ready to put off at once."

"At once!" The captain stared his amazement. "'Ere it is night. At once, 'e says!"

"It's very necessary that we go at once," said Curlie firmly, "and I believe you have your orders."

"To be hat your service in hevery particular."

"All right then, we must be on our way in an hour."

"Wot course?" The skipper rose to his feet.

"This is the point we must reach with all speed," said Curlie, drawing the photograph of the mysterious old map from his pocket and pointing to the star near the center. "Compare that with your own chart, locate it as well as you can and then mark out your own course."

The skipper stared at him as though he thought Curlie crazy.

"That! Why that--"

Turning quickly, he disappeared up the hatch, to return presently with a chart. This he placed upon the table, beside the photograph.

After five minutes of close study he turned an astonished face upon the boy.

"That, as I 'ave thought, is five 'undred miles hout to sea. Five 'undred miles in a c.o.c.klesh.e.l.l. Man, you're daft."

"All right," said Curlie; "the trip's got to be made. I thought you might be afraid to undertake it; that's why I wanted to know at once.

I'll go out and hunt another skipper. There's surely plenty of them idle these dull times."

"Hafraid, did 'e say! Me! Hafraid!" The skipper was purple with rage.

"Hafraid 'e says. 'E says it, a bloomin' Yankee kid, an' me as 'as 'ad ships sunk under me twice by the b.l.o.o.d.y German submarines! Me, Captain Jarvis, hafraid."

He turned suddenly upon Curlie. "Go git yer togs an' shake a leg er the bloomin' _Kittlewake_'ll be off without you on board."

"That's the talk!" smiled Curlie. "Never fear! We'll be here."

He turned to Joe. "You go ash.o.r.e and buy us each a suit of roughing-it things, a so'-wester and the like. We'll need 'em. I'll be back in less than an hour."

When Curlie returned from his mission ash.o.r.e he carried but one bundle.

That resembled a fencepost in size and shape. It was carefully wrapped and sealed in sticky black tar cloth.

"Going to throw a message overboard in case we're lost, I suppose,"

laughed Joe.

"Something like that," Curlie laughed back. Nevertheless, he carried the thing with great care to his stateroom and deposited it beneath his berth in the cabin forward on the main deck.

An hour later the two boys were standing on deck watching the sh.o.r.e lights fade. Each was busy with his own thoughts and wondering, no doubt, in his own way how much of adventure this trip held for him.

CHAPTER XIII

A GHOST WALKS

"Ever take much interest in gasoline engines?" Curlie suddenly inquired of Joe.