ten o'clock
shouted a man from the inside of a near-by store , and Jack dropped his conversation and began to clean off the sidewalk with vigor . Hal walked on . He did not know under what exciting circumstances he was to meet Jack McCabe again . Promptly at ten o'clock Hal presented himself at the number given him on Wall Street . The sign over the door read Sumner , Allen & Co. , Brokers . He opened the door and entered . There was a small place in the front partitioned from the rear office by a counter and a brass grating .