Mass market paperback.

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From amazon.com

Fahrenheit 451 is set in a grim alternate-future setting ruled by a tyrannical government in which firemen as we understand them no longer exist: Here, firemen don't douse fires, they ignite them, and they do this specifically in homes that house the most evil of evils: books.

Books are illegal in Bradbury's world, but books are not what his fictional (yet extremely plausible) government fears: They fear the knowledge one pulls from books. Through the government's incessant preaching, the inhabitants of this place have come to loathe books and fear those who keep and attempt to read them. They see such people as eccentric, dangerous, and threatening to the tranquility of their state.

One day a fireman named Montag meets a young girl who demonstrates to him the beauty of books, of knowledge, of conceiving and sharing ideas; she wakes him up, changing his life forever. When Montag's previously-held ideology comes crashing down around him he is forced to reconsider the meaning of his existence and the part he plays.

Left onn the bookshelf.