"Go back there!" cried Grace, aghast.
"Why not?" asked Betty, coolly. "You forget we have a man with us now."
"Certainly we'll go back there and look," spoke Mrs. Mackson, in business-like tones. "Though I don't believe Mollie would go back, unless it was to look for us. And how can she have gone in without us seeing her?"
"There may be many entrances to an old, rambling place like this," said Mr. Blackford. "It will do no harm to look about in it again, and then we can search up and down the road."
Rather gingerly the girls entered the old house again. The light was flashed in all the rooms downstairs, but the girls balked at going to the upper floors, though Mr. Blackford proposed it.
"Mollie would not go up there," said Betty, positively.
"Perhaps not," admitted Mr. Blackford.
"I think we ought to go back to where we left the auto," said Mrs. Mackson. "That would be the most likely place for Mollie to go."
"I agree with you!" exclaimed the young man, quickly. "We'll go to the stalled auto."
As they were leaving the place there burst upon them a shrill, weird cry, like that of some animal, and it was followed by that deep groan that vibrated through the vacant rooms.