Chapter 1: The Ice Bridge
* Will Parry, who fled his home in Cittàgazze in the previous book, discovers a frozen bridge connecting his world to the parallel world of Cittagazze.
* He ventures onto the bridge, encountering curious creatures called "ghasts" and evading dæmon-eaters.
* Upon reaching Cittagazze, Will finds the city abandoned and desolate, its buildings crumbling and overgrown.
Chapter 2: Lyra's Journey
* Lyra Belacqua, accompanied by her dæmon Pantalaimon, continues her arduous journey to the North.
* They are captured by a group of Tartars, savage raiders who plan to sacrifice Lyra to their god.
* With the help of Iorek Byrnison, the armored bear, Lyra escapes and makes her way to Svalbard, a frozen island north of Norway.
Chapter 3: The Tower of the Angels
* In the world of Cittagazze, Will meets Tony Makarios, a soldier from Will's own world who has also found the ice bridge.
* Tony reveals his possession of a device called the "subtle knife," which can cut through anything and create new doorways between worlds.
* Will and Tony search for the "Tower of the Angels," where the subtle knife was stolen.
Chapter 4: The Amber Spyglass
* Lyra and Iorek Byrnison arrive at Svalbard and encounter a witch named Serafina Pekkala.
* Serafina possesses the "amber spyglass," a powerful artifact that allows one to view distant lands and worlds.
* Lyra uses the spyglass to locate her father, Lord Asriel, who is imprisoned in Cittàgazze.
Chapter 5: The Showdown
* Will and Tony infiltrate the Tower of the Angels and confront the Authority, the tyrannical ruler of Cittàgazze.
* Lyra and her allies launch an attack on Cittàgazze, using the amber spyglass to coordinate their efforts.
* Will uses the subtle knife to cut a doorway between Cittàgazze and the world where Lyra is.
Chapter 6: The Battle of the Willows
* The armies of Cittàgazze and the rebels clash in an epic battle in the willows near Oxford.
* Lyra and Will confront the Authority, who reveals his true nature as a parasitic entity that feeds on Dust, the essential particles of the human soul.
* Will uses the subtle knife to sever the Authority's connection to Dust, causing it to dissolve into nothingness.
Chapter 7: Farewell to the Worlds
* In the aftermath of the battle, Will and Lyra decide to sever the connection between their worlds.
* Tony Makarios volunteers to remain in Cittàgazze to guard the subtle knife.
* Will and Lyra bid farewell to their friends and return to their own worlds, with the knowledge that they can never truly be apart.
