In the beginning of Fahrenheit 451, Guy Montag walks home with Clarisse McClellan. Once they get to her house she asks Guy if he is happy. Guy responds yes but this question changes how he looks at the world.
Capitan Beatty and his crew get a call/report that someone is reading books. They arrive at the location and start to throw the books out to the lawn, the old lady which was the owner of the books claims that she'd rather die than live without her books. She lights the books on hire herself and burns with them.
Guy has been reading books and Beatty finds out. He arrives at Guy's house and tells him that he will burn the books if Guy doesn't do it himself. Guy does burn the books but he also burns Beatty and two other firemen that were with Beatty.
You're not the only one.
Since Guy killed Beatty and two other men the police were called and the mechanical hound is also now on the look for Guy. The police also announce that he is fleeing from a crime and that everyone should be on the lookout for a man running with books in his hand.
The hound was tracing Guy's scent and followed him to a river. The bad news was that Guy was already more than 300 yards downstream when the hound arrived at the river.
Guy got out of the river and found campers in the forest. They invited him to sit with them and told him that they were also fleeing from justice like him. They knew about Guy because they had a TV and were watching the police chase.