The girls were of course a good deal alarmed. We made the door fast with a prop in case an attack should be made.
Suddenly a large stone fell on the roof with a tremendous bump and clatter! It caused the girls to cry out in affright!
"Ad, this is somebody trying to scare us!" Tom muttered.
"Or murder us!" cried Ellen.
"You don't suppose it is Halse, do you?" I asked. "He threatened us with something or other!"
"Maybe," said Addison, doubtfully. "No; I don't believe he would dare come up here alone in the night," he added, after a moment's thought. "Halse is a great coward in the dark."
On the whole it did not seem likely that Halstead would be so many miles from home, in the woods, at that time of night.
Another stone struck on the roof, and soon a third struck the door! Then several seemed to fall on the roof at once, which led us to surmise that there was more than one person concerned in the attack.
Both Addison and Tom kept their eyes at the cracks, looking out to see if any of our assailants showed themselves.
"They are standing out there in that hazel clump, just beyond the other cabin," Addison muttered. "I can see the bushes move there, every time a stone is thrown."