Without an instant’s hesitation O’Reilly followed her, not only because he wished to help, but because he dared not be left alone. The presence of this strange, lost woman comforted him; he must not lose sight of her, whatever happened. He had to run, she went so rapidly, ever just in front, moving with confidence and certainty, turning right and left, crossing the street, but never stopping, never hesitating, her companion always at her heels in breathless haste, and with a growing terror that he might lose her any minute. The way she found her direction through the dense fog was marvellous enough, but O’Reilly’s only thought was to keep her in sight, lest his own panic redescend upon him with its inevitable collapse in the dark and lonely street. It was a wild and panting pursuit, and he kept her in view with difficulty, a dim fleeting outline always a few yards ahead of him. She did not once turn her head, she uttered no sound, no cry; she hurried forward with unfaltering instinct. Nor did the chase occur to him once as singular; she was his safety, and that was all he realized.

One thing, however, he remembered afterwards, though at the actual time he no more than registered the detail, paying no attention to it—a definite perfume she left upon the atmosphere, one, moreover, that he knew, although he could not find its name as he ran. It was associated vaguely, for him, with something unpleasant, something disagreeable. He connected it with misery and pain. It gave him a feeling of uneasiness. More than that he did not notice at the moment, nor could he remember—he certainly did not try—where he had known this particular scent before.

Then suddenly the woman stopped, opened a gate and passed into a small private garden—so suddenly that O’Reilly, close upon her heels, only just avoided tumbling into her. “You’ve found it?” he cried. “May I come in a moment with you? Perhaps you’ll let me telephone to the doctor.”

She turned instantly. Her face close against his own, was livid.

“Doctor!” she repeated in an awful whisper. The word meant terror to her. O’Reilly stood amazed. For a second or two neither of them moved. The woman seemed petrified.

“Dr. Henry, you know,” he stammered, finding his tongue again. “I’m in his care. He’s in Harley Street.”

Her face cleared as suddenly as it had darkened, though the original expression of bewilderment and pain still hung in her great eyes. But the terror left them, as though she suddenly forgot some association that had revived it.

“My home,” she murmured. “My home is somewhere here. I’m near it. I must get back—in time—for him. I must. He’s coming to me.” And with these extraordinary words she turned, walked up the narrow path, and stood upon the porch of a two-storey house before her companion had recovered from his astonishment sufficiently to move or utter a syllable in reply. The front door, he saw, was ajar. It had been left open.

For five seconds, perhaps for ten, he hesitated; it was the fear that the door would close and shut him out that brought the decision to his will and muscles. He ran up the steps and followed the woman into a dark hall where she had already preceded him, and amid whose blackness she now had finally vanished. He closed the door, not knowing exactly why he did so, and knew at once by an instinctive feeling that the house he now found himself in with this unknown woman was empty and unoccupied. In a house, however, he felt safe. It was the open streets that were his danger. He stood waiting, listening a moment before he spoke; and he heard the woman moving down the passage from door to door, repeating to herself in her low voice of unhappy wailing some words he could not understand:

“Where is it? Oh, where is it? I must get back....”