flees to the Gyptians, canal-faring nomads, whose children have also been abducted. They reveal to Lyra that Asriel and Mrs Coulter are actually her parents. The Gyptians form an expedition to the Arctic with Lyra to rescue the children. Lyra recruits Iorek Byrnison, an armoured bear, and his human aeronaut friend, Lee Scoresby. She also learns that Lord Asriel has been exiled, guarded by the bears on Svalbard. Near Bolvangar, the Gobbler research station, Lyra finds an abandoned child who has been cut from his dæmon; the Gobblers are experimenting on children by severing the bond between human and dæmon, a procedure called intercision. Lyra is captured and taken to Bolvangar, where she is reunited with Roger. Mrs Coulter tells Lyra that the intercision prevents the onset of troubling adult emotions. Lyra and the children are rescued by Scoresby, Iorek, the Gyptians, and Serafina Pekkala's flying witch clan. Lyra falls out of Scoresby's balloon and is taken by the panserbjørne to the castle of their usurping king, Iofur Raknison. She tricks Iofur into fighting Iorek, who arrives with the others to rescue Lyra. Iorek kills Iofur and takes his place as the rightful king. Lyra, Iorek, and Roger travel to Svalbard, where Asriel has continued his Dust research in exile. He tells Lyra that the Church believes Dust is the basis of sin, and plans to visit the other universes and destroy its source. He severs Roger from his dæmon, killing him and releasing enough energy to create an opening to a parallel universe. Lyra resolves to stop Asriel and discover the source of Dust for herself. The Subtle Knife Lyra journeys through Asriel's opening between worlds to Cittàgazze, a city whose denizens discovered a way to travel between worlds. Cittàgazze's reckless use of the technology has released Spectres which destroy adult souls but to which children are immune, rendering the world empty of adults. Here Lyra meets and befriends Will Parry, a twelve-year-old boy from our world's Oxford. Will, who recently killed a man to protect his ailing mother, has stumbled into Cittàgazze in an effort to locate his long-lost father. Venturing into Will's (our) world, Lyra meets Dr. Mary Malone, a physicist who is researching dark matter, which is analogous to Dust in Lyra's world. Lyra encourages Dr. Malone to attempt to communicate with the particles, and when she does they tell her to travel into the Cittàgazze