The elevator deposits Vyr, Bjorn, Whisper, Torrin, Yurias, Ernan, and Bjork in the outer circle of the Chained Fortress, a layered industrial slum where exhausted laborers work until death and the Chain has stripped nearly everyone of emotion. While searching for a route toward the final Crystallic fragment, they meet Ollivander, a fourteen-year-old thief whose incomplete chain scars leave him a few years before enthrallment. He leads them to the Chunky Link, a tavern operated by Ike and connected to a small underground resistance. Ike cannot take them into the inner circles, but he offers them entry to a secret blackjack game whose winners may meet the resistance's benefactor. In the prosperous second circle, Helena continues posing as the inquisitor Drexella, tells Raphael that Myles allowed her companions to fall into the outer circle, and learns that the city's citizens will gather at the Panopticon the following evening so someone of royal blood can be chosen to stand before Draxus Cale and attempt to open the sealed door.
Whisper, Torrin, and Yurias follow Ollivander into the sewers while the others prepare for the card game. A familiar wind leads Whisper and Torrin into supernatural darkness, where they encounter the Cataract from Gavra. The Cataract claims to appear wherever they are lost, but admits that she does not recognize these tunnels and was drawn there by the Harbingers' light. When Yurias magically brightens their torch, the living darkness retreats and the Cataract vanishes within it. At the resistance outpost, Chugga reveals that the sewers beneath the outer circle are blocked from the inner districts and that a nearby factory has spent years constructing an unknown machine with workers reduced to vacant shells. Back at the Chunky Link, Bjorn and Vyr learn that death is the only known escape from full enthrallment. Whisper then defeats the inner-circle players at blackjack and wins a golden ring that protects its wearer from the Chain, several glints, a potion of diminution, a promised favor, and an audience with the mysterious benefactor.
Helena enters the Inquisition office, where magical chains force her to submit and demand the names of her companions. The chains react to Ernan and Bjork, then withdraw after Helena gives her own name, and a voice orders her to come to the Panopticon. Simon, the exuberant voice of Draxus Cale, welcomes her inside and delivers her to the fortress's master: an immense, ancient suit of flawless armor animated by will and red light. Draxis calls Whisper and Ernan his surviving children and claims that only their changed mortal blood can open the Dios Ostium, but Helena offers the Crystallic as an alternative and secures an ultimatum: by the following night, she must bring him the artifact, complete or incomplete, or he will use his sons. Wylas Velpa emerges beside the throne and reveals that he and Gavra's House Lords served as the Chain's eyes upon the mainland. At the same time, the benefactor at the Chunky Link reveals himself as the Lion of the Shadowed Dawn and confirms that Gavra was never free: Draxis used it as a controlled environment in which to raise his children. Helena leaves the Panopticon under Simon's watch while the others sit with the Lion and confront how completely the Chain has shaped their journey.