In Don't Drink Poison, you and your friends become secret agents going on secret missions to try and steal information from each other to gain points. All cards played in the game are added to a set of cards known as a "Mission".
Each player has their own Mission and players can only play cards to their own Mission (unless otherwise stated by the card). When a mission reaches 7 cards total, it is considered complete and the player that owns that mission gains all the cards inside of it and starts a new mission. If a mission is poisoned, the player that completes it gains no points and takes damage instead. the first player to 10 points OR the last player standing wins the game.