ten o'clock
The detective pauses , and again wipes his face . `` My gratitude for your perseverance I can never fully express to you . I owe you a debt I never can repay . To-morrow , at ten o'clock , I will meet you at your house ; and then , if you can leave me alone with her -- '' `` Certainly , certainly , everything will be at your service , Madame , '' returns the detective , rising from his seat and thanking the lady , who rewards him bountifully from her purse , and bids him good night . The servant escorts him to the door , while Madame Montford buries her face in her hands , and gives vent to her emotions . On the morning following , a neatly-caparisoned carriage is seen driving to the door of a little brick house in Crosby street . From it Madame Montford alights , and passes in at the front door , while in another minute it rolls away up the street and is lost to sight .