From the introduction: In order to play Den of Thieves you need a scenario deck and some protagonist characters. You can use a normal deck of 52 playing cards if you want to use the scenario deck included in this document. Protagonists are fantasy thieves in a fantasy city, and the rules for creating them are given later. During the game, each player takes on one or more roles. There must always be one dealer, one antagonist, and one or more protagonists. Anyone who is playing but not as one of these three roles makes up the audience until they take on a role.