Are you up for a thrilling adventure?The Mystery Kids are faced with their most puzzling mystery yet when a young actress vanishes without a trace during a screening of her latest movie.Follow the children as they confront a terrifying avalanche, fall into a raging river, creep along a secret passageway, write an invisible message, fly to a secluded island, and more!This adventure novel is set in 1950's Britain and will suit anyone who enjoys Nancy Drew, the Hardy Boys or the Famous Five.