The Quidnunc and the Hounds
From the creator of the "Legendary Quest" RPG, and the author of "RPG Design Patterns" comes a storytelling game that takes a radically different approach to story improvisation than any other game before it.
Ten years in the making, MacGuffin is a cooperative storytelling game. It provides a framework to guide you in creating a gripping story with intertwined plots and character development. It is hysterical at times, tragic at others. Unlike most games, there are no winners or losers, only cool stories.
The game takes advantage of the fact that there are only a relatively small number of plots used in all stories, from ancient myths to modern-day movies. MacGuffin provides 10 main plots and 18 sub-plots from which players can choose to mix into their story. Each of these provides very general guidance and questions about each step in each plot. Players improvise what happens at each step, inspired by the various personality traits of the characters involved in the story.
You can download the game rules for free! So you can see if you think you'd like the game before you buy it.