'Delphie and the Magic Spell' by Darcey Bussell, the 2nd in the series of Magic Ballerina books They can be read independantly, without having read others from the series). Just as Delphie is settling into her ballet school, she is whisked away to the magical world of Enchantia. King Rat has cast a terrible spell. Can Delphie help her new friends put things right? Approx age 5-8 years. Other titles from the series available separately.