the pavement level. This puzzled Aubrey, but he focussed his glasses on the door of the shop. He saw Weintraub pull a key out of his pocket, insert it very carefully in the lock, and open the door stealthily. Leaving the door ajar behind him, the druggist slipped into the shop.
"What devil's business is this?" thought Aubrey angrily. "The swine has even got a key of his own. There's no doubt about it. He and Mifflin are working together on this job."
For a moment he was uncertain what to do. Should he run downstairs and across the street? Then, as he hesitated, he saw a pale beam of light over in the front left-hand corner of the shop. Through the glasses he could see the yellow circle of a flashlight splotched upon dim shelves of books. He saw Weintraub pull a volume out of the case, and the light vanished. Another instant and the man reappeared in the doorway, closed the door behind him with a gesture of careful silence, and was off up the street quietly and swiftly. It was all over in a minute. Two yellow oblongs shone for a minute or two down in the area underneath the door. Through the glasses he now made out these patches as the cellar windows. Then they disappeared also, and all was placid gloom. In the quivering light of the street lamps he could
