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Humble Bundle - Sir Terry Pratchett's Discworld
(www.humblebundle.com)
Anything related to the fantasy genre
I also haven't read it, but I've seen this graphic in the past and been fascinated by it without having read any.
The city watch novels are by far my favourite. Jingo is especially amazing as a lighthearted deconstruction of xenophobia and how it functions, as well as another big theme of modern politics I can't talk about because it's a huge spoiler.
Man this would have helped me immensely. I started chronologically but this would have made more sense