By Noel Streatfeild

Pauline, Petrova and Posy Fossil are sisters - with a difference. All three were adopted as babies by Great Uncle Matthew, an eccentric and rich explorer who then disappeared, leaving them in the care of his niece Sylvia. The girls grow up in comfort until their money begins to run out and nobody can find Great Uncle Matthew. Things look bleak until they hit on an inspired idea: Pauline, Petrova and Posy will take to the stage. But it's not long before the Fossils learn that being a star isn't as easy as they first thought...

By Helen Lipscombe

Milly yearns to dance like her ballerina mum - but during the biggest performance of her life, she messes up and her mum disappears. Six months on, Milly receives an unexpected invitation to join the Swan House School of Ballet. Thrilled, Milly accepts, only to find that Swan House is no ordinary ballet school: it's a ballet school for spies. Can her new skills help her discover the truth about her mother's vanishing act?