Down through the gloom from the camp above came a number of dark forms. Over the rail they came.

One of them whispered to Bowler:

“You did your work well, Jack. The rest are in the cabin, are they?”

“They are, cap’n. We ought to make sure of ’em in their sleep. Dead men tell no tales.”

CHAPTER XI.
A TREACHEROUS GAME.

But Dooley, for he it was, said sharply:

“No! You mustn’t kill one of them. I want them held for prisoners. I have a purpose in view!”

“All right!” said Bowler, sullenly.

Toward the cabin door the interlopers crept. In a jiffy they had taken possession of every part of the air-ship.

A terrible peril hung over the heads of our sleeping voyagers, and yet they slept on, all unsuspecting it.