CHAPTER XXX
THE SECRET OF THE MYSTERIOUS VOICE
"What do you think of that?"
Such was the question which several of the boys put to each other simultaneously.
"Why didn't somebody shoot at the ghost?" asked Snap.
"Why didn't you, Shep?" queried Giant.
"I—er—I forgot about it."
"The ghost vanished too quickly," said Snap. "But keep on guard—it may come back."
"If it does it will get something from me sure," murmured the doctor's son, and raised his shotgun.
"What do you think it was? " asked Whopper, after a painful pause of several minutes.
"A man," answered Snap, promptly.
"A man!" cried Giant.
"Yes, a man—and I don't know whether we ought to shoot at him or not," continued the leader of the gun club. "We certainly don't want to commit murder."
