Clue: A Philosophical Guide Through the Mystery is the largest available deep-dive into the world of Cluedo. This project began with a simple question: "why do I keep losing to my sister at this game?" And so a thousand collective hours of research later trying to find the answer, we present to you this book. It is designed for everyone, from someone who has never encountered the game before to someone who grew up playing it around the family table. It comprehensively covers the history, gameplay, strategy, mathematical properties, psychology, and deductive methods underlying the game. Our aim is to share with the world our fascination with this game. We hope you enjoy