about twelve o'clock at night
`` I shall never forget this service . '' `` I am a rough , ignorant man , '' replied Robie quietly ; `` but I know gentle blood when I see it . '' `` What time of night will suit you best ? '' `` Just about twelve o'clock at night . That is the time all the ghosts and goblins and weetches choose ; and when all honest people are in their beds , and in their first and soundest sleep . '' `` We shall not be able to give you much warning , for we must wait a favorable wind and tide . '' `` So you let me know by nightfall , it will do . ''