The Mystery of the Secret Room is a book from one of Enid Blyton's many mystery series, such as The Secret Seven or The Famous Five. The plot would center on a group of children who discover a hidden, concealed room within a house or old building. The discovery of the room leads them to investigate its purpose, often unraveling a long-lost secret involving treasure, a historical event, or a recent crime. The book is a classic Blyton adventure.
