Her flashlight stabbed through the darkness. Narrow stairs immediately in front of her led upward; at her right was a connecting door to the secondhand shop. Without an instant's hesitation she ran up the stairs. There was no need to observe caution since the place was temporarily untenanted; there was need only of haste. She opened the door at the head of the stairs, and, with a quick, eager nod of satisfaction, as the flashlight swept the interior, stepped over the threshold. It was the room she sought--old Luertz's bedroom. And now the flashlight played inquisitively about her. The bed occupied a position by the window; across one corner of the room was a cretonne hanging, that evidently did service as a wardrobe; across another corner was a large and dilapidated washstand; there were a few chairs, and a threadbare carpet; and, opposite the bed, another door, closed, which obviously led into the front room. Rhoda Gray stepped to this door, opened it, and peered in. She was not concerned that it was evidently used for kitchen, dining-room and the stowage of everything that overflowed from the bedroom; she was concerned only with the fact that it offered no avenue through which any added risk or danger might reach her. She closed the door as she had found it, and gave her attention now to the walls of old Luertz's bedroom. She smiled a little whimsically. The Crab had used a somewhat dignified term when he had referred to “panels.” True, the walls were of stained wood, but the wood was of the cheapest variety of matched boards, and the stain was of but a single coat, and a very meager one at that! The smile faded. There were a good many knots; and there were four corners to the room, and therefore eight boards, each one of which would answer to the description of being the “sixth panel.” She went to the corner nearest her, and dropped down on her knees. As well start with this one! She had not dared press Danglar, or Danglar's deformed brother, for more definite directions, had she? She counted the boards quickly from the corner to her right; and then, the flashlight playing steadily, she began to press first one knot after another, in the board before her, working from the bottom up. There were many knots; she went over each one with infinite care. There was no result. She turned then to the sixth board from the corner to her left. The result was the same. She stood up, her brows puckered, a sense of anxious impatience creeping upon her. She had been quite a while over even these two boards, and it might be any one of the remaining six!