Uncle Daniel was hurrying down the stairs now.
"There it is again," whispered Bert, as another group of wild chords came from the piano.
"It must be cats!" exclaimed Uncle Daniel. "Harry, come down here and help light up, and we'll solve this mystery."
Without a moment's hesitation Bert and Harry were down the stairs and had the hall light burning as quickly as a good match could be struck.
But there was no more music and no cats about.
"Where is Snoop?" asked Uncle Daniel.
The boys opened the hall door into the cellarway, and found there Snoop on his cushion and Fluffy on hers.
"It wasn't the cats," they declared.
"What could it be?"
Uncle Daniel even lighted the piano lamp, which gave a strong light, but there didn't seem to be any disturbance about.