These publications, typically paperback books accompanying a series of young adult mystery novels, offer supplementary puzzles, ciphers, and clues related to the main narrative. They often include maps, coded messages, and other interactive elements designed to enhance the reader’s engagement and problem-solving skills. For instance, a volume might contain a coded letter that reveals a hidden location within the corresponding narrative, allowing readers to “solve” the mystery alongside the protagonist.
These supplementary materials serve several key functions. They provide an immersive experience, encouraging active participation and critical thinking. By offering additional layers of complexity and intrigue, they enhance the replayability of the core novels. Historically, they represent a unique approach to interactive storytelling, anticipating later developments in transmedia narratives and augmented reality gaming. These companion texts fostered a sense of community among readers, creating opportunities for shared problem-solving and discussion.