Frank's hand felt carefully over the wall.
"Turn it on when I give the word," said Jack. "I may need to see what I am doing."
"All right; but be careful, Jack."
Slowly Jack tiptoed across the room, where he could dimly see a form stretched across a bunk. Bending over the figure, Jack raised a hand and then called to Frank:
"Lights, Frank!"
Instantly, Frank threw the switch and then sprang forward to lend Jack a hand should it be necessary. But his assistance was not needed. Jack's fist rose and fell once and the form in the bunk gasped feebly once and lay still.
"I don't like that sort of thing," said Jack, "but I suppose it had to be done. Help me bind him up and gag him. He's not badly hurt and will come round in a few minutes."
It was the work of but a few moments to tear the sheets into strips and to bind and gag the helpless man. Then Jack and Frank left the cabin.
At almost the same instant von Ludwig and Harris came from a second cabin.
"All right?" asked von Ludwig.