"What is that?" exclaimed Joel, springing to his feet.
"A cry!" replied Hulda.
"Yes, a cry of distress."
"From what direction did it come?"
"Let us listen."
Both looked first to the right, and then to the left of the fall, but they saw nothing, though they had certainly heard the words "Help! help!" uttered during one of the intervals between each rebound of the Rjukan.
The cry was repeated.
"Joel, some one who is in danger is calling for help," cried Hulda. "We must go to his aid."
"Yes, sister; and he can not be far off. But in what direction? Where is he? I see no one."