three o'clock
When he had gone the clerk made a note of it . Then , glancing out the window , he became aware that the Attit mendicant , for some reason dissatisfied , was preparing to move on . Yawning , the clerk resumed his street coat , and went out to lunch , carelessly leaving the door unlocked , and the memorandum of the Greek 's invitation exposed upon his blotter . When he returned at three o'clock , the door of Mr. Labertouche 's private office was ajar and that gentleman was at his desk . The memorandum was , however , gone . Mr. Labertouche was in the process of opening and reading a ten-days ' accumulation of correspondence , an occupation which he suspended temporarily to call his clerk in and receive his report . This proved to be a tolerably lengthy session , for the clerk , whose name appeared to be Frank , demonstrated his command of a surprising memory .