about three o'clock
`` Yes , Madam de Cartier , '' Sue Hemphill said , equal to the occasion . `` It was dreadful , was n't it ? As if some one were horribly frightened . It was about three o'clock , I think . I was awake and heard the clock striking on the lower corridor . What could it have been ? '' `` I really do n't know , Miss Hemphill , though I have a theory .