“What’s that?” cried Scoop, straightening. [[180]]

“Sure, the buildin’ that you just mentioned was put up when Mrs. Matson was alive. She wouldn’t let the ould gintleman mess around the house with his puzzles, so he built himself a room on the roof of his mill where he could work undisturbed. And because his wife said that he was fiddlin’ away his time like a crazy man, the new workshop was called the crazy puzzle room.”

“I was told,” said Scoop, “that it was an office.”

“Sure, the ould gintleman would have been crazy, indeed, to have built an office on the roof of his mill! No, the buildin’ never was intended for an office, though a lot of people got that idea. It was, as I have just told you, a workroom.”

“We think the money is hid in the room’s plastered walls,” said Scoop.

“An’ what gives you that idea?”

“Because the room is ten feet square.”

Mrs. Kelly knitted her forehead.

“ ‘Under ten an’ ten,’ ” she muttered, thinking. Her eyes lighted up. “Sure, the money is under the floor, boys, not in the wall.”

“Under the floor?” cried Scoop.