Will Parry crosses into a world with a city called Cittagazze and encounters Lyra Belacqua. He finds the Subtle Knife — a blade that can cut windows between worlds. The middle volume of His Dark Materials expands the multiverse and introduces the concept of Dust as a contested force between science and religion.
The conclusion of His Dark Materials — Lyra and Will descend into the land of the dead, the war against the Authority reaches its climax, and the full theological argument of the trilogy is made explicit. The first children's book to win the Whitbread Prize.
The conclusion of Robinson's Mars trilogy — Mars is now green and blue, the terraforming essentially complete. The political, ecological, and personal questions opened by Red Mars and Green Mars are resolved, as the original colonists age and the generation they created comes into its own.