Once a year, the greatest tabletop gamers in the world descend upon Indianapolis for Gen Con—the Best Four Days in Gaming—to play games, see friends, and have fun. They play things like Dungeons & Dragons, Magic: The Gathering, Warhammer 40,000, Settlers of Catan, Munchkin, and everything else they can get their hands on. Mostly the competition is friendly. Sometimes it is not. When a world-famous game designer turns up murdered at the convention, Liam Parker—the young game designer who stumbles across the body—makes it his quest to figure out who killed the man, and why. In the end, Liam must figure out the rules of this most dangerous game fast—or risk losing his life.