Why is everyone so afraid of the castle on the hill? What dark secrets lurk inside its walls? Philip, Dinah, Lucy-Ann, Jack and Kiki the parrot are on holiday in the countryside, staying beside Castle Hill. And when they see flashing lights in a distant castle tower, they decide to investigate. But a sinister plot is hidden within the castle’s spooky towers and gloomy secret tunnels… The kind of book that turns kids into lifelong readersA classic Blyton mystery with an atmospheric settingThe ideal next step up for fans of The Famous Five A thrilling tale of intrigue, sleuthing and teamworkSupplied as a pack of six copies.