Sam (11) and his friends love adventure books. But now, they are caught in a mystery of their own! A prize-winning dog, milk bottles, expensive jewellery... these are just some of the things that go missing from their high-rise building. Who is the culprit? Is it an insider? As they dive deep into the riddle, the Book Club finds help from a most unexpected person. But soon, Sam becomes the police's prime suspect! What happens next? Can the Book Club solve the mystery fast enough? Find out, as you join them on this thrilling ride.