The final volume of
The Book of Dust trilogy, and a sequel to both
The Secret Commonwealth and the
His Dark Materials series, follows Lyra Silvertongue as she continues her search for her daemon Pantalaimon (Pan) across Central Asia and into another world. In Pullman's universe, every person has a daemon, an animal-shaped manifestation of their inner self, and Lyra's separation from Pan has left her incomplete. She is also pursuing the mystery of a red building in the desert of Karamakan, which contains an opening into another world.
The story begins at the ruined city of al-Khan al-Azraq, where Lyra meets Nur Huda, a daemon-separated teenager whom Pan guided and directed to wait for Lyra, and who tells her Pan passed through heading east to find something Lyra has lost. Mysterious voices warn Lyra about the alkahest, "the destroyer of bonds" (7). To free Nur Huda's captive daemon from a steel cage, Lyra removes the needle from her alethiometer, a golden truth-telling instrument. The needle cuts through metal effortlessly, but a thief steals the alethiometer's body. A gryphon, a massive creature half lion and half eagle, snatches the thief into the sky along with the instrument. Lyra retains only the needle and the glass.
Several parallel storylines unfold. Glenys Godwin, the director of the covert intelligence organization Oakley Street, receives two resonating lodestones, flat stones from another world that enable instantaneous communication. Marcel Delamare, President of the Magisterium, the dominant theocratic power in Lyra's world, discovers 17 openings between worlds and orders Colonel Schreiber to destroy them all with thermobaric explosives. Meanwhile, Pan rescues a small gryphon named Gulya, who was cursed by a sorcerer named Sorush to remain small until she kills him. A gryphon squadron takes Pan to the palace of their queen, Shahrnavāz, atop Mount Damāvand near the Caspian Sea. Separately, Malcolm Polstead, an Oxford scholar and Oakley Street agent, lies wounded in a Turkish prison. His daemon Asta has separated from him to scout. A fellow agent rescues Malcolm, and they head for Aleppo.
In Aleppo, Lyra's guide Abdel Ionides introduces her to Mustafa Bey, the most powerful merchant on the Silk Roads. Mustafa Bey identifies Lyra despite her alias, shares knowledge of trade that once passed through the red building, and gives her a
laissez-passer for safe passage eastward. Malcolm arrives independently. Olivier Bonneville, the son of a man Malcolm killed years earlier, attacks Lyra in the Brazilian Embassy garden, but she fights him off. When Magisterial soldiers arrive, gryphons swoop down. Ionides is arrested; a gryphon seizes Malcolm and carries him to Damāvand, where Pan is waiting. Lyra flees with Asta, and they agree to pose as person and daemon for safety.
At Damāvand, the gryphons prize Malcolm for his golden coloring. Queen Shahrnavāz commands him to repair a broken alethiometer, which Pan confirms is Lyra's stolen instrument. Malcolm begins beating the gold case into a circlet for Lyra. He discovers a resonating lodestone Godwin sent him and begins exchanging intelligence with Oakley Street. Meanwhile, Lyra infiltrates the residence of Aleppo's nuncio, a church diplomat, using the alethiometer needle to free the imprisoned Ionides. Leila Pervani, Ionides's former lover who is secretly working against the Magisterium, helps them escape. Traveling east to Baku, Lyra collects a resonating lodestone at the post office and communicates with Malcolm for the first time.
Pan departs Damāvand with the witch Tilda Vasara to fly ahead to Tashbulak and the red building. Malcolm proposes a deal to Queen Shahrnavāz: He will help Gulya kill Sorush, whose cavern holds an immense gold hoard, and in return the Queen will provide the circlet and an escort of gryphons to Karamakan. Hundreds of witches arrive at Damāvand, and Malcolm argues before the gryphon queen and the witch leaders that the Magisterium's explosions are degrading the atmosphere by closing the openings between worlds. He calls for an unprecedented alliance, and both the queen and the witch leaders agree.
Delamare delivers a sermon in Geneva declaring a holy war, revealing Lyra as his niece and branding her a fugitive. On a ferry from Baku, Lyra encounters an angel who claims the imagination is merely making things up. Lyra argues that angels never dream, never make art, and cannot understand the imagination. News arrives that Mustafa Bey has been assassinated, collapsing trade across the Silk Roads and rendering Lyra's
laissez-passer worthless. She escapes on a fishing boat with Ionides, Asta, and Leila.
The allied forces converge at a burning mountainside in the Caucasus, where Malcolm and Lyra confront Sorush. Malcolm shatters the sorcerer's magic mirror and renders him visible with water and pumice dust. Lyra focuses moonlight through the alethiometer glass onto Sorush's flesh, and Gulya kills him, breaking free of the curse to grow to her full size. Ionides and Leila then depart willingly aboard a Magisterium vessel. Lyra is shaken until Ionides sends a lodestone message explaining they infiltrated deliberately, warning of a mysterious third enemy at Tashbulak.
At Tashbulak, Pan discovers that development workers' daemons are passive, sickly, or dead. Brynmor Strauss, a botanist and former researcher at the station who had previously entered the red building and survived to return to Tashbulak, warns of a plague inside. Dilyara, a former cleaner at the research station who stayed on after the raiders' attack to restore its laboratories, shows Pan a cloud chamber in which particles of Dust, the consciousness-linked substance pervading the universe, visibly recoil from a dead daemon's body. Pan also learns from Bonneville's sleeping daemon that Lyra and Bonneville are half-siblings, both children of the late Mrs. Coulter, and that Delamare had Bonneville's father framed and destroyed.
Malcolm and Lyra fly on Gulya's back to the red building, where an enormous painted panorama depicts the rose world in full prosperity. Passing through the far door, they enter that world and find it devastated: Machines tear up rose gardens, and workers' daemons lie dead or ignored. Displaced residents describe how a new monetary system dissolved every traditional bond. Lyra realizes the alkahest is not a physical substance but the system of corporate development and monetization that dissolves all connections: between people and their daemons, between communities and their traditions, between meaningful work and mere profit.
When they try to return, the door is locked. Inside the red building, Bonneville and Pan have entered ahead of Delamare's soldiers. Having learned that Delamare destroyed his father, Bonneville stabs Delamare in the throat with a clasp knife Ionides gave him, killing the President of the Magisterium. The thermobaric bomb, called the
tonnerre double, detonates, killing Schreiber and his men and shattering the opening into thousands of tiny fragments. Outside in the rose world, Lyra finds the stationary fragments, each a minuscule surviving window. She places the alethiometer needle into one and cuts downward, widening the gap. She calls for Pan, and Pantalaimon tumbles through into her arms. Ionides and Leila walk up the slope toward them, and Lyra greets Ionides with joy.
During a moon festival by the lake, Lyra and Pan articulate what they have discovered: The Rose Field, as Lyra renames the Rusakov field of consciousness, pervades everything, and Dust is what happens when the imagination touches it. The imagination is not invention or pretense but the faculty that activates consciousness. Pan suggests it works in both directions, like pollen fertilizing a living thing. Bonneville approaches and addresses Lyra as his sister. They acknowledge their shared parentage, and he throws the knife into the lake. He plans to find work as an alethiometer reader; Lyra says she expects to go on telling stories.