But that doesn't mean what you might expect, Pullman told NPR editor Glen Weldon. He wants readers to consider the new work not as a simple extension of the original trilogy, but as a "companion" to it.
"The [new] story begins before His Dark Materials and continues after it," he said, "... you don't have to read it before you read [the original trilogy] ... this is another story that comes after it, so it's not a sequel, and it's not a prequel, it's an equal."
The title, The Book of Dust, refers to an invisible substance that figures largely in the earlier books — a fictional elementary particle that harbors a mysterious affinity with human consciousness.
"That's what I really wanted to explore in this new work," he said. "More about the nature of Dust, and consciousness, and what it means to be a human being."
Pullman has already followed up the original trilogy with two novellas and an audiobook. He said he was motivated to revisit the world of Lyra and her companions with a full trilogy because "I sensed a big story. I sensed the presence, in the way that you do, of another story that hadn't been told, and I went closer and ... thought about it and lived with it for a while and discovered that yes, it was a big story, and it did deserve to be told, it deserves its own books."
On where The Book of Dust will fall in the saga
Well, the first book is set roughly ten years before the action of His Dark Materials. And the second book and subsequent books ... are set ten years after it. So in the first one, Lyra is only a baby of about six months. So she's not able to do very much, but she's certainly the focus of intense activity on the part of the main protagonists. In the second book she will be twenty years old, she'll be an adult....
It's a sort of companion book, if you like. It doesn't stand before [His Dark Materials], it doesn't stand after it, it stands beside it.
On why he's calling it The Book of Dust
Dust is something which terrifies the religious authorities in His Dark Materials. It seems to have something to do with human consciousness, it seems to have something to do with experience, or as they call it, "sin." But they don't know what it is, or why it's important, and they're terrified of it. Now, in the course of the story, Lyra and her companions discover something about Dust, something important: that it's not a bad thing, it's a good thing.
On whether the overwhelming worldwide reaction to the original trilogy colors his writing of the new one
When I wrote the first series, starting in 1993, I didn't expect more than a readership of about two or three thousand. That's sort of based on previous experience and thinking what sort of book it was, I didn't think it would have very wide audience but maybe a few people would enjoy it. The fact that it was received with such interest all over the world in 40 different languages really did amaze me.
It didn't change what I was doing, though, because I was already in my late 40s when I was starting that, I wasn't a very young writer bowled over by all the response and attention and so on. I was pretty clear and determined about what I was doing and how I was doing it. The only difference it made was that I had a lot more letters to write back. To answer. Nowadays I communicate by Twitter, but back in those days there were a lot of letters to write back, which I duly did.
On his impatient readership
Well, I have a standard answer. When people say "How's The Book of Dust getting along? When's it going to be finished?" I say, with perfect truth, "It is three pages longer today than it was yesterday."
On the criticism his books have received
I've been greatly criticized for the attention to religion that I give in the books, but I've been criticized, on the whole, by people who haven't read the books. My attitude to religion is that religion is a most interesting and extraordinary human phenomenon. I'm fascinated by it, interested in it, and at some points critical of it. And the points when I become critical are the points when politics come into it, and religion acquires political power — political with a small "p," for example, within the confines of a single family, or Political with a large "P," on a national or international scale.