Northern Lights

At Bolvangar, Lyra is captured and about to undergo intercision—the severing of a child from their dæmon—when Mrs. Coulter arrives and halts the procedure at the last moment, explaining that the process is meant to spare children from painful adult emotions. Before it can be attempted again, Lyra triggers the station's alarm and sets the building on fire, freeing the imprisoned children. In the chaos, Lee Scoresby, Iorek Byrnison, the Gyptians, and Serafina Pekkala's witch clan arrive and fight off the station's guards, and Lyra escapes with Roger and Iorek aboard Scoresby's hot air balloon, which the witches tow northward toward Lord Asriel's location on Svalbard.

During the flight, Lyra falls from the balloon and is captured by armored bears loyal to Iofur Raknison, the usurper king who has exiled the rightful heir, Iorek. Taken to Iofur's castle, Lyra manipulates Iofur into accepting a formal duel with Iorek, who arrives with Roger to rescue her. Iorek kills Iofur in single combat and reclaims his throne as the true king of the panserbjørne. With his kingship restored, Iorek escorts Lyra and Roger onward to find Lord Asriel.

At Asriel's camp in Svalbard, he explains his research into Dust to Lyra: that it connects to countless parallel universes and is regarded by the Church as the physical origin of sin. Asriel then leads Roger out into the snow, with Lyra and Iorek following the sled tracks. As Asriel climbs toward a mountaintop where he has set up his equipment, a battle erupts—witches allied with Asriel clash with Iorek's bears, while Mrs. Coulter and Tartar soldiers attack in a military airship. Mrs. Coulter reaches the summit and briefly embraces Asriel, but he then severs Roger from his dæmon, killing the boy and releasing a tremendous burst of energy that tears open a bridge in the Northern Lights leading into a parallel universe. Asriel walks through the breach into the other world, and, devastated by Roger's death, Lyra and Pantalaimon follow him through the opening as the book ends.

Lyra Belacqua, a headstrong twelve-year-old raised at Jordan College, Oxford, has spent the book uncovering a web of secrets involving her supposed uncle, Lord Asriel, and the glamorous Mrs. Coulter—who, she learns from the canal-dwelling Gyptians, are actually her real parents. Before leaving Oxford, Lyra was given an alethiometer, a truth-telling device she can read almost instinctively, by the Master of Jordan College.

Lyra discovers that Mrs. Coulter secretly runs the General Oblation Board, the organization behind the "Gobblers" who have been kidnapping children—including Lyra's friend Roger—to experiment on them at a Arctic station called Bolvangar. There, children are subjected to intercision, a process that severs them from their dæmons (animal-formed manifestations of their souls), often killing or maiming them in the process.

Traveling north with a Gyptian expedition, Lyra allies with the armored bear Iorek Byrnison, whose throne was usurped by Iofur Raknison, and the aeronaut Lee Scoresby. She also meets the witch Serafina Pekkala and learns of a secret prophecy about her that the witch clans have been told but that Lyra herself does not know. Lyra leads the raid that frees the children of Bolvangar, during which Mrs. Coulter halts her own intercision just in time.

In the escape, Lyra is captured by bears loyal to Iofur, tricks him into a duel with Iorek, and Iorek kills him, becoming the rightful bear king. Lyra and Roger then travel with Iorek to find Lord Asriel, who has been experimenting with Dust—mysterious particles tied to consciousness, sin, and the existence of parallel worlds—while in exile on Svalbard.

In the book's climax, amid a battle between Asriel's witch allies, Iorek's bears, and Mrs. Coulter's Tartar forces, Lord Asriel kills Roger by severing him from his dæmon in order to release enough energy to tear open a passage between universes. Asriel walks through this rift into a parallel world, and a grief-stricken Lyra, together with her dæmon Pantalaimon, follows him through the opening.

Going into the next book, Lyra is alone in an unfamiliar world, still carrying the alethiometer, having lost Roger and been abandoned again by both parents. Unresolved threads include the true nature and purpose of Dust, the prophecy the witches have kept from Lyra, the coming war hinted at throughout the book, and the fate and intentions of both Lord Asriel and Mrs. Coulter.