Alan had not noticed, when he stepped into the hall in the morning, whether the house then had been heated; now he appreciated that it was quite cold and, probably, had been cold for the three days since his father had gone, and his servant had left to look for him. Coming from the street, it was not the chilliness of the house he felt but the stillness of the dead air; when a house is heated, there is always some motion of the air, but this air was stagnant. Alan had dropped his hat on a chair in the hall; he unbuttoned his overcoat but kept it on, and stuffed his gloves into his pocket.

A light in a single room, he thought, would not excite curiosity or attract attention from the neighbors or any one passing in the street; but lights in more than one room might do that. He resolved to turn off the light in each room as he left it, before lighting the next one.

It had been a pleasant as well as a handsome house, if he could judge by the little of it he could see, before the change had come over his father. The rooms were large with high ceilings. The one where he stood, obviously was a library; bookshelves reached three quarters of the way to the ceiling on three of its walls except where they were broken in two places by doorways, and in one place on the south wall by an open fireplace. There was a big library table-desk in the center of the room, and a stand with a shaded lamp upon it nearer the fireplace. A leather-cushioned Morris chair—a lonely, meditative-looking chair—was by the stand and at an angle toward the hearth; the rug in front of it was quite worn through and showed the floor underneath. A sympathy toward his father, which Sherrill had not been able to make him feel, came to Alan as he reflected how many days and nights Benjamin Corvet must have passed reading or thinking in that chair before his restless feet could have worn away the tough, Oriental fabric of the rug.

There were several magazines on the top of the large desk, some unwrapped, some still in their wrappers; Alan glanced at them and saw that they all related to technical and scientific subjects. The desk evidently had been much used and had many drawers; Alan pulled one open and saw that it was full of papers; but his sensation as he touched the top one made him shut the drawer again and postpone prying of that sort until he had looked more thoroughly about the house.

He went to the door of the connecting room and looked into it. This room, dusky in spite of the light which shone past him through the wide doorway, was evidently another library; or rather it appeared to have been the original library, and the front room had been converted into a library to supplement it. The bookcases here were built so high that a little ladder on wheels was required for access to the top shelves. Alan located the light switch in the room; then he returned, switched off the light in the front room, crossed in the darkness into the second room, and pressed the switch.

A weird, uncanny, half wail, half moan, coming from the upper hall, suddenly filled the house. Its unexpectedness and the nature of the sound stirred the hair upon his head, and he started back; then he pressed the switch again, and the noise stopped. He lighted another match, found the right switch, and turned on the light. Only after discovering two long tiers of white and black keys against the north wall did Alan understand that the switch must control the motor working the bellows of an organ which had pipes in the upper hall; it was the sort of organ that can be played either with fingers or by means of a paper roll; a book of music had fallen upon the keys, so that one was pressed down, causing the note to sound when the bellows pumped.

But having accounted for the sound did not immediately end the start that it had given Alan. He had the feeling which so often comes to one in an unfamiliar and vacant house that there was some one in the house with him. He listened and seemed to hear another sound in the upper hall, a footstep. He went out quickly to the foot of the stairs and looked up them.

"Is any one here?" he called. "Is any one here?"

His voice brought no response. He went half way up the curve of the wide stairway, and called again, and listened; then he fought down the feeling he had had; Sherrill had said there would be no one in the house, and Alan was certain there was no one. So he went back to the room where he had left the light.

The center of this room, like the room next to it, was occupied by a library table-desk. He pulled open some of the drawers in it; one or two had blue prints and technical drawings in them; the others had only the miscellany which accumulates in a room much used. There were drawers also under the bookcases all around the room; they appeared, when Alan opened some of them, to contain pamphlets of various societies, and the scientific correspondence of which Sherrill had told him. He looked over the titles of some of the books on the shelves—a multitude of subjects, anthropology, exploration, deep-sea fishing, ship-building, astronomy. The books in each section of the shelves seemed to correspond in subject with the pamphlets and correspondence in the drawer beneath, and these, by their dates, to divide themselves into different periods during the twenty years that Benjamin Corvet had lived alone here.