Clifftoppers: The Thorn Island Adventure, Paperback/Fleur Hitchcock

For Aiden, Chloe, Ava and Josh, holidays at their grandparents' cottage mean wild beaches, no curfew, Bella the dog, and most of all - adventure!While sailing their Grandad's boat along the coast with her cousins, Chloe sees a terrified face at a tower window on Thorn Island.