I highly recommend it. It's part of the Witches series of Discworld books. I'm hard pressed to find one I don't like, but that is certainly one of my favourites. Although it's full of a lot more humour and wit than I make it seem, it's also not without it's more serious moments. To quote a full description of Elves:

Elves are wonderful. They provoke wonder. Elves are marvellous. They cause marvels. Elves are fantastic. They create fantasies. Elves are glamorous. They project glamour. Elves are enchanting. They weave enchantment. Elves are terrific. They beget terror. The thing about words is that meanings can twist just like a snake, and if you want to find snakes look for them behind words that have changed their meaning. No one ever said elves are nice. Elves are bad.

It's not hatred. It's a statement of fact. I love cats and would never wish harm on one, but I also acknowledge that the only reason it isn't trying to bat me around for a few hours before it might eat my half dead mangle is that it's jaw is too narrow for my neck. Plus, domestic house cats are responsible for the extinction of no less than 2 species of Lizard, 21 mammals, and 40 birds. You can't really call them benevolent creatures. They might show affection and again, make a pleasing noise every now and then, but that glamour makes people forget the above mentioned facts. Because people at heart want to love and see the best in everything, and don't like to remember bad things. Even sometimes the would be predators.

To further my previous quote, "Style. That's all anyone remembers."

It's more used as a frame of reference to give an example of the average Elf mindset in 'Lords and Ladies'. How they operate around life, and how they see and entrance others, and how what they offer, a brief memory, a pleasing visage, or even actual power over others through their Glamour. In the end there is no real value come sunrise, and all you're left with is the smell of the wilderness, and lost lives.

Even then it doesn't quite do them justice. Discworld Elves are so proud and full of themselves, the idea that other life is capable of feeling the same emotions as them is laughable to them. "They would break the world if they thought it would make a pretty sound."

The kind that feel nice and look pretty and make pleasing noises, but at the end of the day would only do something if it benefited them. The kind that like to inflict as much cruelty as they can before finally killing their prey.

A quote from Sir Terry Pratchett: "If cats looked like frogs we'd realise what nasty, despicable, horrible little buggers they were."