Lord Canterville, family of the ghost sells the castle to Mr.Otis. In the story he refuses the jewels, who Virginia recived from the ghost, because the ghost can be come back as he takes the jewels away.
This is Mr.Otis, he is in the beginning of the story the new owner of the Canterville Castle. Before him it was Lord Canterville, a man who notified Mr.Otis how dangerous this castle is. He wants to sel the castle as fast as he can. Finally Mr.Otis has bought the castle.