Paperback. BRAND NEW PAPERBACK. ( 409 Pages) : : Is: Dido's Younger Sister, Is Twite, Has Gone North To Try And Find Her Lost Cousin But Instead Of The Promised Playland, She Finds An Underground Kingdom Where Children Work As Slaves In The Most Appalling Conditions. : Suggested Readership = Children (Please note that the description may reference other related books/items that do not form part of this ISBN)