Cassie comes through.

The day Cassie has been dreading since she first arrived at Starling Academy is here. She has been chosen to make the journey to Wishworld for the next Wish Mission. Cassie is so sensitive and perceptive she'll be a natural! But her mission is even harder than she feared when everything just seems all wrong. Could Cassie be the first Star Darling who simply can't make her Wisher's wish come true?