There's a ruined castle on finniston farm, but only the dungeons remain - and nobody knows where they are! The famous five are determined to find them - and whatever is hidden in them - but they are not alone. Someone el...There's a ruined castle on finniston farm, but only the dungeons remain - and nobody knows where they are! The famous five are determined to find them - and whatever is hidden in them - but they are not alone. Someone else wants to know, too.