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. Could the face belong to recently kidnapped George, the only child of a rich local businessman? No one they tell believes there could be a child held prisoner in the tower. Certain that the villains are hiding out nearby, the cousins must use all their skills and cunning to conduct a daring rescue. Fleur Hitchcock is famous for her excellent "thrillers for beginners". This action-packed series takes 7+ readers on fantastic, realistic adventures. Cover illustration by Tom Clohosy Cole. Don't miss the other Clifftoppers adventures!The Arrowhead Moor AdventureThe Fire Bay AdventureThe Frost Castle AdventureLook out for Fleur Hitchcock's stories for older readers:Dear ScarlettSaving SophiaMurder In MidwinterMurder At TwilightThe Boy Who Flew