How many hours later she was awakened by a dream about Margaret Detweiler, Mary Louise had no way of knowing, for she had left her watch on the bureau. She thought she had found Margaret alone in an empty house, cold and starving to death, and she was trying to remember just what principles of first aid to apply, when she awoke and found it was only a dream.

But something, she realized instantly, had awakened her. Something—somebody—was in her room!

Her first sensation was one of terror. A ghost—no, a gypsy, perhaps—who would clap a gag over her mouth and bind her hand and foot! But before she uttered a sound she remembered where she was and why she was there. A delirious feeling of triumph stole over her, making her believe that success was at hand for her in her sleuthing. If this person were really the Stoddard House sneak thief, Mary Louise could lie still and watch her, for the room was light enough from the moon and the street lamps to show up the intruder quite plainly.

Ever so cautiously, without turning her head or making any kind of sound, she rolled her eyes toward her bureau, where she could sense the intruder to be. Her reward was immediate: she saw a short person in dark clothing standing there, carefully picking up some object.

“My purse—and my watch!” Mary Louise thought grimly. The little engraved watch her father had given her last Christmas.

The figure turned around and silently crept towards the door. But sudden, swift dismay took possession of Mary Louise, making her tremble with fear and disappointment. The thief was not a woman, whom she could hope to identify as a guest at Stoddard House. He was a man!

He turned the key in the lock so quietly that only the tiniest click could be heard. Then, just as softly, he closed the door again and vanished into the hall.

Mary Louise gasped audibly with both relief and disappointment. Relief that he was gone, disappointment that he was a common, ordinary burglar whom she could not hope to catch.

Nevertheless, she meant to do what she could, so she turned on her light and reached for the telephone beside her bed. In another moment she had told her story to the police, and, so perfect were their radio signals, in less than five minutes one of their cars stood at the door of the hotel.

Meanwhile, Mary Louise had hastily thrown on a few clothes and run down the stairs to warn the night watchman.