“This is sure mysterious,” went on Dave. “I can’t see anything, but I can hear, and I can—feel!” he added a moment later, for again the craft moved slightly.

Once more the young aviator peered out, but he could discern nothing. The night was very black.

“If I thought——” he began, when a sleepy voice from the adjoining berth inquired:

“Whatsmatter, Dave? Time f’r brkfust?”

“Hiram! Hiram!” whispered Dave shrilly. “Wake up! Something has happened—it’s happening now!”

Instantly Hiram sat upright in his bed. He was rather a slow chap, but on occasions could move lively.

“What is it?” he inquired in a low voice. “Burglars in here, Dave?”

“I don’t know. Maybe it is and maybe it isn’t. Anyhow, I don’t think they’re in yet.”

“All right, then; wait until they do get in an’ we’ll nab ’em. Lay low!”

“That’s just what I don’t want to do,” replied Dave. “Something may happen unless we get busy. They may even get away with the Albatross.”