From the introduction:
In Act One, we get to know the PCs by seeing what their life is like in the organization. We learn more about their Hooks and their Outs. Hooks give a sense of why the characters have stuck with the Organization. Outs are the people who give PCs a reason to get out of the Organization before it’s too late. Act One culminates in a tipping point for each PC - a concrete action that catapults them into the most important decision of their lives.
In Act Two, we turn up the heat. PCs have to choose sides as the actions from Act One come to a head. As the Organization puts pressure on the PCs to uphold their vows, the Outs promise escape and peace. Act Two ends with each character’s fate made clear: freedom, death, or resignation to a life of crime.
Act Three is our epilogue. We learn about the ultimate results of Act Two’s climax. PCs, Outs, and the Organization itself all receive closure in Act Three.