Milly yearns to dance like her ballerina mum - but during the biggest performance of her life, she messes up and her mum disappears.
But this is no ordinary ballet school: it\'s a school for spies ....
Six months on, Milly receives an unexpected invitation to join Swan House, a prestigious ballet school.
Milly yearns to dance like her ballerina mum - but during the biggest performance of her life, she messes up and her mum disappears