Fahrenheit 451 is set in a world where censorship has over run society. 'Individualism' is not accepted, and to be different in any way, whether that be outstanding looks or exceptional intellect, is to be a heretic. The story revolves around Guy Montag, a fireman whose job is no longer to put out fires, but to ignite them in the name of his government. In Guys worlds, knowledge is considered dangerous because it makes people question their surroundings. Literature being the main source of panic.
The book follows Montag after an encounter with a girl named Clarrise who, unlike the rest of the world, thinks, instead of blindly following the pack.After this chance meeting, Montag begins to doubt whether what he does for a living is the right thing. She makes him wonder about what it is exactly that he is keeping from the rest of the population, and its actual dangers upon everyone. He meets Faber, a retire english professor, who takes Montag in and teaches him and helps him gain a better understanding of what forbidden.
The main theme of Fahrenheit 451 would be censorship. Although never really explaining why books are such a threat to society, it suggests plenty of theories of what could happen if people started 'thinking'. Thinking to them would mean chaos would ensue, everyone envious of the knowledge or beauty of others. In short, anything that could offend and cause a disruption of order in Fahrenheit 451 is not looked highly upon.