six o'clock
`` Thank you . Now I 'm off . Do n't sit up for me , Mr. Wetherell ; I 'm going to follow up a clue that may put us on the right scent at last . I do n't think you had better come , Mr. Inspector , but I 'll meet you here again at six o'clock . '' `` You ca n't explain , I suppose ? '' said the latter , looking a little huffed . `` I 'm afraid not , '' I answered ; `` but I 'll tell you this much -- I saw one of the female servants listening at this door .