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The Amber Spyglass
The book is slower to get started than the previous two, with multiple threads to follow, but there's still plenty of Pullman's unique inventiveness, and his mixing of magic and science. Finishing off a trilogy like this is no easy task, and I thought that Pullman did pretty well, although I was a bit confused about Mary Malone and Lyra's temptation, which seemed to be what the book was leading up to. I would say that if you like a good story and don't mind Pullman's strange take on various subjects then you should give these books a try.