'I know I've returned to it frequently...and I know I'll continue to do so.' Philip Pullman. The extraordinary world of Philip Pullman's best-selling trilogy is explored in all the detail any fan of the books will ever need. With in-depth, chapter-referenced sections on characters, places, creatures, sciences, languages, and much more, this brilliant work by Laurie Frost has become the official-and definitive-reference guide to Pullman's books.