Having watched the movie I am currently reading Rita Hayworth and Shawshank Redemption.
The Shawshank Redemption is one of the best movies I've watched, Tim Robbins and Morgan Freeman are great. Books usually ruin the movie if I watch the movie second, or vice versa, but not in this case. The book gives slightly different details (perhaps for good reasons) but it gives good extra insight which I love. I also recommend Vanity Fair and Crime and Punishment.