What is the exposition in the mysterious Benedict society?

In "The Mysterious Benedict Society," the exposition introduces the main characters: Reynie, Sticky, Kate, and Constance, who are recruited by Mr. Benedict to take on a secret mission. The story is set in a world facing a crisis caused by the sinister "Emergency" broadcast that manipulates people's thoughts. Mr. Benedict, a kind and eccentric man, explains the importance of their unique skills and intelligence in combating the threat posed by the villainous Mr. Curtain. This sets the stage for their adventure and the challenges they will face together.