Philip Pullman’s fantasy series His Dark Materials is a trilogy that includes the novels Northern Lights (1995; also published as The Golden Compass, The Subtle Knife (1997), and The Amber Spyglass (2000). Pullman published a sequel or prequel—or, as he called it, an “equel”—known as The Book of Dust trilogy, which includes La Belle Sauvage (2017), The Secret Commonwealth (2019), and The Rose Field (2025).