idnight
struck, all was dark and silent. Only the faint sound of the wind among
the trees in the park came to her ears. She wondered whether it was
necessary for her to pretend to walk in her sleep this night--in order
that the doctor might feel that her case was a real one. She rose
softly, undecided, and going to the window, looked out.

The room in which she then was, occupied a position at the rear of the
building, and in one of its two wings. From the center of the main
building she observed a covered passageway, or bridge, extending out for
perhaps a hundred feet and terminating in a sort of square tower. In one
of the rooms in the tower, on a level with herself, she saw lights, and
the figure of a man moving about.

The place attracted her attention. She wondered what its use could be.
Then an inspiration struck her. The covered bridge ran from the main
hall not thirty feet from her own door. She determined to cross it,
pretending to be walking in her sleep, and find out what she could
regarding the brick tower. When the time came, she knew that all the
information she could possess about the house and its occupants would be
necessary to the success of her plans.

She threw about her a dressing-gown, and quietly opened her door. The
maid was nowhere to be seen, but doubtless she would shortly return. The
chair upon which she had been sitting, at the point where the side and
main halls met, stood directly beneath the electric light. No doubt,
Grace thought, she had been called away for a few moments by one of the
other patients on the floor.

Now was her chance. She stepped noiselessly down the cross hall, her
eyes wide open and hands clenched at her sides. At the junction of the
two halls she turned to the right, toward a door which, she judged, gave
entrance to the covered way. She found this unlocked, opened it, entered
the passageway and closed the door behind her. Then she began to walk
slowly along the bridge.

It was a narrow structure, not exceeding five feet in width, with top
and sides of corrugated metal, and a floor of wooden planks. At the far
end of it she perceived a glass door, behind which shone a brilliant
light.

She approached the door cautiously, keeping up all the while the
pretense of walking in her sleep. This was not easy--she did not know
just how persons who were somnambulists acted, but she had read
descriptions of such cases, and had once seen a play in which one of the
charact