What happens in book 6 chapter 8 of the return of the kings?

It is nightfall when the hobbits arrive at Brandywine and the scene is "all very gloomy and un-Shirelike." They are blocked at the gate and there is a sign that reads: "No admittance between sundown and sunrise." The guards at the gate are surprised when they learn that Frodo and Merry and Pippin have arrived. Mr. Lotho has become Chief of the town and he has tyrannized and oppressed the people with the help of a few wild men. Of course, the hobbits who have just returned from battle are not dismayed by the challenge before them and they intend to galvanize the hobbits of the region and remove Mr. Lotho and his henchmen from their positions. They find that a sizeable portion of the population has been jailed as they were unwilling to obey Mr. Lotho and his henchman, Sharkey. The village successfully chases out the henchmen and they learn that Mr. Lotho is a puppet leader. Sharkey is the real Chief. Sharkey reveals himself to be Saruman and Saruman laughs with revenge because he has destroyed so many of the homes and gardens of Hobbiton. The hobbits move to strike at him but Frodo withholds them. Saruman passes by Frodo and flashes a knife, attempting to stab him, but Frodo is wearing a coat of mail beneath his garment and the knife does no damage. Frodo remains patient and forgiving and he refuses to strike at Saruman, but this only angers Saruman. Asking about Mr. Lotho, the hobbits learn from Saruman that Wormtongue has killed him‹but Wormtongue is enraged because Saruman forced him to do this. Wormtongue then draws his own knife and cuts Saruman's throat. Wormtongue is shot dead with arrows before Frodo even has a chance to speak. Saruman's body emits a grey mist and then it dissolves into nothing.