Here was food such as a lone bachelor might cook for a quick repast, a saucer containing what evidently represented the half of a can of beans which had not been eaten. There was a full quart of milk, and a bottle which was half emptied. A dish contained a quarter-pound square of butter, still in its original tissue wrapping, and a smaller piece of irregular shape. There was a small bottle of whipping cream, a jar of mustard, some sliced boiled ham which had evidently been picked up at a delicatessen store, and a small pasteboard container holding macaroni salad of the type featured by virtually every delicatessen counter.

There were other odds and ends in the icebox, but Mason didn’t stop to explore them. The quick inventory which he took told all he needed to know. He noticed that the milk and cream were still sweet. The temperature regulator on the icebox was set at a point which would hold the contents at a low temperature. The food smelled sweet and clean, but with an ice box of this efficiency, that meant absolutely nothing. The food might have been left there yesterday or last week.

Mason closed the door of the icebox, let his small flashlight cover the kitchen in a quick survey. Then he moved on into the dining room.

His flashlight gave him a general idea of the furniture, an old-fashioned assortment which had evidently been purchased years before. The dining-room rug was new and cheap. The surface of the table had been refinished. The chairs had evidently been gone over with furniture polish, but the incongruity of the new dining-room rug simply made it all the more apparent that someone, after having lived in the house for years, had decided to rent it furnished, and had made an attempt to replace only the things which had been the most worn.

Mason moved on through the dining room and into the living room.

Here were bookcases built in on each side of a fireplace, wide windows fronting on the porch. The drapes on these windows seemed relatively new, and Mason realized with some apprehension that while these drapes had been pulled so that they entirely covered the front windows, the material was not heavy enough to shut out all light. The beam of Mason’s flashlight would quite probably show through from the street, and the small rectangular windows placed high in the wall above the bookcases on each side of the fireplace were not curtained at all. Della Street could warn him of any approaching pedestrian, but persons in the adjoining houses would be apt to notice the traveling beam of the flashlight as it moved around the walls.

Mason’s problem was not that of an ordinary prowler. He needed his flashlight for more than mere illumination to enable him to avoid furniture. He wanted to make a detailed study of the things in that room, to segregate those things which had been furnished with the house, so that he could more fully appreciate the significance of those things which had been brought in by the tenant.

Mason hesitated only a moment. Then he walked across toward the front door and pressed the light switch.

Instantly the room was flooded with brilliance. Mason found several floor lamps, turned these on. He opened a book, placed it face down on the table. In case some curious neighbor might be peering in through those uncurtained windows above the fireplace, he removed his hat and slowed down his motions so that they would seem to be the casual moves of a legitimate tenant, rather than the hasty motions of a prowler.

An automobile driven at high speed slewed around the corner. Tires shrilled in protest as the car slid to an abrupt stop. The doorbell rang — once. Mason paused, motionless.