About ten o'clock
`` Yes , I did . Count Ferruci was with me that night , and stayed here until the next morning . '' `` What time did he arrive ? '' `` About ten o'clock , or , to be precise , '' said Jorce , `` about ten-thirty . '' `` Ah ! '' cried Lucian exultantly , `` then Ferruci must have been the man in the back yard ! '' `` What do you mean by that ? ''