A few moments later Jack Bailey, seeing a thin glow of candlelight from the attic above and hearing Lizzie's protesting voice, made his way up there. He found them in the trunk room, a dusty, dingy apartment lined with high closets along the walls--the floor littered with an incongruous assortment of attic objects--two battered trunks, a clothes hamper, an old sewing machine, a broken-backed kitchen chair, two dilapidated suitcases and a shabby satchel that might once have been a woman's dressing case--in one corner a grimy fireplace in which, obviously, no fire had been lighted for years.

But he also found Miss Cornelia holding her candle to the floor and staring at something there.

"Candle grease!" she said sharply, staring at a line of white spots by the window. She stooped and touched the spots with an exploratory finger.

"Fresh candle grease! Now who do you suppose did that? Do you remember how Mr. Gillette, in Sherlock Holmes, when he--"

Her voice trailed off. She stooped and followed the trail of the candle grease away from the window, ingeniously trying to copy the shrewd, piercing gaze of Mr. Gillette as she remembered him in his most famous role.

"It leads straight to the fireplace!" she murmured in tones of Sherlockian gravity. Bailey repressed an involuntary smile. But her next words gave him genuine food for thought.

She stared at the mantel of the fireplace accusingly. "It's been going through my mind for the last few minutes that no chimney flue runs up this side of the house!" she said.

Bailey stared. "Then why the fireplace?"

"That's what I'm going to find out!" said the spinster grimly. She started to rap the mantel, testing it for secret springs.

"Jack! Jack!" It was Dale's voice, low and cautious, coming from the landing of the stairs.

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Bailey stepped to the door of the trunk room.

"Come in," he called in reply. "And shut the door behind you."

Dale entered, turning the key in the lock behind her.

"Where are the others?"

"They're still searching the house. There's no sign of anybody."

"They haven't found--Mr. Anderson?"

Dale shook her head. "Not yet."

She turned toward her aunt. Miss Cornelia had begun to enjoy herself once more.

Rapping on the mantelpiece, poking and pressing various corners and sections of the mantel itself, she remembered all the detective stories she had ever read and thought, with a sniff of scorn, that she could better them. There were always sliding panels and hidden drawers in detective stories and the detective discovered them by rapping just as she was doing, and listening for a hollow sound in answer. She rapped on the wall above the mantel--exactly--there was the hollow echo she wanted.