The door being opened interrupted his remarks. Turning his head to see who the newcomers might be, he startled his companion by saying—"Bless my soul, it's young Barcroft."

"Hullo, pater!" said Billy in astonishment. "You here? This is a regular surprise." Peter got up from his chair.

"Pleased to see you, boy," he exclaimed. "As for the surprise, it's nothing. To-day has been a day of surprises. What brings you ashore?"

"We were in the destroyer that ran aground," explained the flight-sub. "But let me introduce you to Fuller—you've often heard me speak of him—and Bobby Kirkwood, who, as you know, was, and I hope will continue to be, my observer."

"I thought you were in the 'Hippodrome,'" remarked Barcroft Senior, after mutual introductions and when the three airmen had drawn their chairs close to the comforting fire.

"Officially we are now—at the present moment," said Fuller. "Unofficially we are toasting our toes on dry land. Before long we hope to be up in the air; I think I am correctly interpreting the wishes of my two energetic chums?"

Conversation was proceeding briskly when one of the Scouts, called to the telephone, reported that a car was on its way to Scarby to convey the airmen to Tongby, and that there was a train leaving the little place at eight in the morning for Bigthorpe, whence by the main line to the north they could reach Edinburgh by about noon.

"And this breaks up the party," quoth Billy as the motor drew up outside the station. "Well, good-bye, pater. Sorry time has been so short."

"Not so fast with your good-byes, my son," protested Peter. "We—Entwistle and I—are going into Tongby by this car. It may be a tight squeeze, but we'll risk that."

"But how about Butterfly?" asked Billy.