Why is everyone so afraid of the castle on the hill? What dark secrets lurk inside its walls? Philip, Dinah, Lucy-Ann, Jack & Kiki the parrot are on holiday in the countryside, staying beside Castle Hill. & 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 & gloomy secret tunnels… The kind of book that turns kids into lifelong readers A classic Blyton mystery with an atmospheric setting The ideal next step up for fans of The Famous Five A thrilling tale of intrigue, sleuthing & teamwork Supplied as a pack of six copies.