Thud!, by Terry Pratchett
For years, people have been telling me I need to read Pratchett's books based on my love of Douglas Adams and Larry Niven. They were right. His books are always shelved in science fiction/fantasy, but it's actually rather difficult to categorize him. This particular book was more a mystery than anything else; it just happened to take place in a world with vampires, werewolves, dwarfs, and a little bit of magic. The writing is fast-paced, with a healthy dose of British quirkiness that occasionally had me laughing out loud. As an introduction to Terry Pratchett, it definitely makes me want to read more of his work, and I greatly look forward to doing so.