nine o'clock
`` We 're going to Mrs. Martin 's to dinner , dearie . She invited us over the telephone this morning . There 's a very nice dinner prepared for you children , and you must have a good time by yourselves , and not be lonesome . Go to bed promptly at nine o'clock , as we shall be out late . '' `` Is father going , too ? '' cried Marjorie , aghast . `` Yes , of course .