The main action in this chapter takes place in the office of Mustapha Mond. Bernard Marx, John the Savage, and Helmholtz Watson have all gone to see the Controller because they are in trouble (because of the riot in the previous chapter).
What is most important about this chapter is that we find out that Mond himself used to be a rebel like the three of them are. He tells them that he was almost sent to an island for punishment but that he chose to become a leader instead.
This is interesting because it shows us that the people who are smartest and most perceptive either rule society or are so dangerous to society that they must be exiled.