"It certainly was the piano," he said, much puzzled.
"And sounded like a cat serenade," ventured Harry.
"Well, she isn't around here," laughed Uncle Daniel, "and we never heard of a ghost in Meadow Brook before."
All this time the people upstairs waited anxiously. Flossie held Nan so tightly about the neck that the elder sister could hardly breathe. Freddie and Sandy were still under the bedclothes, while Mrs. Bobbsey and Aunt Sarah listened in the hall.
"Dat sure is a ghost," whispered Dinah to Martha in the hall above. "Ghosts always lub music," and her funny big eyes rolled around in that queer way colored people have of expressing themselves.
"Ghosts nothin'," replied Martha indignantly. "I dusted every key of the piano to-day, and I guess I could smell a ghost about as quick as anybody."
"Well, I don't see that we can do any good by sitting around here," remarked Uncle Dan to the boys, after the lapse of some minutes. "We may as well put out the lights and get into bed again."
"But I cannot see what it could be!" Mrs. Bobbsey insisted, as they all prepared to retire again.
"Neither can we!" agreed Uncle Daniel. "Maybe our piano has one of those self-playing tricks, and somebody wound it up by accident."
But no sooner were the lights out and the house quiet than the piano started again.