He made sure that his automatic pistol was in his pocket, questioned the dull sounds of the riverside for a moment, looking about him anxiously, and then, using the leaning post as a stepping-stone, he succeeded in wedging his foot into a crevice in the wall. By the exercise of some agility he scrambled up to the top, and presently found himself lying upon a sloping roof. The skylight remained well out of reach, but his rubber-soled shoes enabled him to creep up the slates until he could grasp the framework with his hands. Presently he found himself perched upon the trap which, if his information could be relied upon, possessed no fastener, or one so faulty that the trap could be raised by means of a brad-awl. He carried one in his pocket, and, screwing it into the framework, he lifted it cautiously, making very little noise. The trap opened, and up to his nostrils there stole a queer, indefinable odour, partly that which belongs to old Oriental furniture and stuffs, but having mingled with it a hint of incense and of something else not so easily named. He recognized the smell of that strange store-room, which, as Mr. Hampden, he had recently visited. For one moment he thought he could detect the distant note of a bell. But, listening, he heard nothing, and was reassured. He rested the trap back against the frame, and shone the ray of an electric torch down into the darkness beneath him. The light fell upon the top of a low carven table, dragon-legged and gilded. Upon it rested the model pagoda constructed of human teeth, and there was something in this discovery which made Durham feel inclined to shudder. However, the impulse was only a passing one. He measured the distance with his eye. The little table stood beside a deep divan, and he saw that with care it would be possible to drop upon this divan without making much noise. He calculated its exact position before replacing the torch in his pocket, and then, resting back against one side of the frame, he clutched the other with his hands. He wriggled gradually down until further purchase became impossible. He then let himself drop, and swung for a moment by his hands before releasing his hold. He fell, as he had calculated, upon the divan. It creaked ominously. Catching his foot in the cushions, he stumbled and lay forward for a moment upon his face, listening intently. The room was very hot but nothing stirred. VII THE SCUFFLING SOUND Detective Durham, as he lay there inhaling the peculiar perfume of the place, recognized that he had put himself outside the pale of official protection, and was become technically a burglar.