A magical new series where best friends become Secret Princesses!Best friends Charlotte and Mia can't bear it when Charlotte's family moves far away. But when they become trainee Secret Princesses they begin an amazing adventure together - and they can see each other whenever they like!Once in a blue moon, a tiara shaped constellation forms high in the sky above Wishing Star Palace. The four girls that make a wish on these special stars get their wishes granted by the Secret Princesses ... but Princess Poison is determined that this year the wishes won't come true ...Have you read all four books in series four: The Moonstone Collection?