"And after I have left this room see to it that the door is safely closed again, and then once more open the passage."
"What for?"
"Never mind that now. Do you know what you are to do?"
"Yes; close and open the passage twice and say nothing."
"That's it."
They did not have to wait long for darkness. Night was now falling rapidly. They sat in silence as the dark shadows began to fill the room. Harry was in a serious, thoughtful mood and talked but little. Finally, when the room became so dark that they could not see one another's faces, he rose.
"It is time now, Bert," he whispered. "Remember your part."
He stepped to the wall and groping around until he found the spring, pressed it and the stone began to revolve. When the passage was fully open, he peered through into the darkness of the other cell, and whispered:
"Miss Juanita, do not be afraid; it is the American boys. Are you there?"
"Yes," came a soft answer.