Issy is terrified of making mistakes, so when the ChocoExpress flies to her bedroom window on the night of her eighth birthday after she has made a particularly awful one, she doesn’t hesitate to jump on board, escaping her parents before they find out what she has done.

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The ChocoExpress whisks Issy off to Cocoaland, a fascinating place made of one of Issy’s favourite treats...chocolate!

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Accompanied by a young boy named David, Issy embarks on an out-of-this-world adventure, and is determined to never make a mistake again. But can she keep that up forever? And what happens if she can’t?