There's something about dragons that stirs the imagination. Whether they're vicious wyrms, wise, ancient lords, or symbiotic fire lizards, dragons of all shapes and forms seem somehow fascinating (this may have something to do with why so many people go through a "dinosaur phase," which begs the question if fantasy authors writing about dragons simply never quite grew out of it). This can result in dragons, like dwarves, trolls, elves, and other creatures that frequently populate pages in various forms, that seem flat, one-dimensional, or simply indistinct. How many times can we read about how the dragons almost disappeared, but then someone finds and egg and returns the symbiotic dragonriders? So any time I come across a new and interesting take on dragons, I get excited.
A lot of very strange things can, and do, happen on a world that is flat, and is carried on the backs of four elephants perched upon the shell of the great turtle A'Tuan. Terry Pratchett's world and stories seem, on the surface, to be plainly fun. And they are that. Lighthearted and amusing, his stories don't feel heavy, but despite their facade, they in many cases convey unexpected significance. The well-meaning Watch Captain Vimes does just that as he investigates a dwarfish murder.