The Otis family moves into an abandoned mansion that comes with its own mysteries. As they get to know their new neighbors, they also meet the angry ghost of Sir Simon de Canterville (Anthony Head).

Sir Simon steps up his efforts to terrorize the Americans, but the Otis family refuses to be frightened. And when the Otises are challenged by Lady Deborah to host a local cricket match, everyone braces for a royal embarrassment.

The haunter becomes the hunted as the Otis kids attempt to capture Sir Simon. And after Hiram receives devastating news, Lucy is determined not to wallow in the loss and resolves to host a Christmas ball.

Virginia must summon all her courage to defend Sir Simon in the court of the dead. Meanwhile the twins search for buried treasure, but things go terribly wrong. Past and present collide in this stirring conclusion to the miniseries.