Foundryside

Sancia Grado, a thief in Tevanne’s lawless Commons, is hired through her fence, Marino Sarccolini, known as Sark, to steal a box from a waterfront safe. Her unusual ability lets her sense the structure and history of objects by touch, a gift caused by a painful scrived plate implanted in her skull. After infiltrating a foundry, tagging a scrived carriage, and using a dangerous air-sailing rig, she breaks into the Waterwatch offices, opens safe 23D, and escapes with a plain wooden box while her diversion becomes a massive waterfront fire.

Back in her rookery room, Sancia disobeys instructions and opens the box. Inside are notes about the ancient Occidental hierophants and, hidden beneath a false bottom, a golden key covered in impossibly fine scrivings. When she touches it, the key speaks into her mind and calls itself Clef. Clef can open almost any lock by arguing with the scrived logic inside it, and he can sense the plate in Sancia’s head. Testing him on a Candiano campo gate proves his power: he tricks the door into opening inward so violently that it tears itself from the wall. Sancia realizes the merchant houses would kill to possess or destroy him.

Sancia takes Clef to the Scrappers, Claudia and Giovanni, illicit scrivers who confirm that his sigils are unreadable and likely Occidental. Meanwhile, Captain Gregor Dandolo investigates the waterfront disaster. His search leads from the crime lord Antonin di Nove to Sark, but Sancia reaches Sark’s rendezvous first and finds it turned into a trap. A red-haired campo agent uses a golden device to nullify nearby scrivings, causing deadly collapses. Sark is presumed dead, and Sancia flees, broke and hunted.

Gregor searches Sark’s rooms and finds a hidden cache and ledger implicating Orso Ignacio, the Dandolo hypatus. Masked attackers armed with illegal scrivings assault him, but Sancia intervenes, saves him from a shrieker-wielding gunman, then drugs him and escapes. Gregor later confronts Orso, who denies involvement while privately admitting to his assistant Berenice Grimaldi that the stolen artifact was his. Orso sends Berenice to shadow Gregor, but the surveillance draws assassins. Gregor captures Sancia, an ambush forces them into alliance, and Clef commandeers a gravity rig to save them, falling silent afterward.

Berenice brings Sancia and Gregor to Orso. Together they uncover a listening device in Orso’s workshop and trace its handlers to Candiano territory. Sancia and Berenice infiltrate the supposedly closed Cattaneo Foundry and overhear Tomas Ziani ordering mass production of bronze imperiat shells. They learn that Tomas, using Tribuno Candiano’s notes and hidden Occidental artifacts, is trying to replicate a golden device capable of commanding and nullifying scrivings. The group concludes that the original imperiat is in the Candiano Mountain, a vast sentient building created by Tribuno, and that they must steal it.

The team recruits Claudia and Giovanni and plans an underwater infiltration using a sealed capsule, Tribuno’s blood supplied by Estelle Ziani, and an air-sailing escape. Sancia initially refuses, unwilling to be treated as disposable in a rich man’s war. Gregor then reveals the horrors he survived at Dantua and his belief that Tevanne’s systems must be overturned. Moved, Sancia returns and reveals Clef to the whole group. Clef speaks through her and helps them understand that hierophantic tools were made by transferring human minds into vessels during a suspended “lost minute.” Clef remembers that he was once human: Claviedes.

Sancia infiltrates the Mountain, whose sentient mind reveals that Tribuno built it to attract hierophants and that Clef may be the legendary key of Crasedes. But the mission fails. Tomas captures Sancia with the imperiat, while Estelle ambushes Gregor, stabs him, and steals Clef. In captivity, Sancia is contacted by Valeria, an ancient Editor sealed in a nearby box. Valeria explains that Sancia’s plate makes her controllable as an object and offers to rewrite it. Sancia agrees, gaining the ability to see and argue with scrivings directly.

Estelle then reveals herself as the true mastermind. She murders Enrico and guards with hidden devices, kills Tomas with a gravity plate, takes Clef and the imperiat, and prepares to become a hierophant. Sancia escapes and returns to Orso’s group, explaining that Estelle has altered Candiano employee sachets into ritual markers. At midnight, Estelle intends to sacrifice her father, Tribuno, and use the deaths of Candiano workers to empower herself.

With little time, the team improvises. Berenice repairs captured gravity plates, Orso creates a twinned chamber that remotely mimics a lexicon, and Sancia sabotages Candiano gates so they collapse outward, drawing troops away from the Mountain. She then launches herself toward the Mountain on a prototype gravity rig. At the same time, Gregor, revived and mentally controlled by Ofelia Dandolo through human scriving, attacks in a black lorica under orders to kill Estelle and seize the key and a dangerous locked box.

At the Mountain’s summit, Sancia turns the gravity rig into a weapon, imploding part of the structure, but Estelle protects herself with the imperiat. Gregor briefly resists his programming and gives Clef back to Sancia. Midnight strikes, Estelle stabs Tribuno, and Candiano workers begin dying through the sachet ritual. The imperiat commands Sancia to stop, but memories of choice, friendship, and love let her resist. She reaches Valeria’s box and turns Clef in its lock, critically damaging him.

Inside Clef’s failing mind, Sancia meets Claviedes, the mutilated human consciousness within the key. He restores the key’s original function at the cost of severing his bond with her. Valeria emerges as a towering golden figure, freezes time, nullifies Estelle’s ritual dagger, and departs after warning Sancia that an old monster in Tevanne will not forgive her. Estelle dies, Tribuno is dead, Sancia retrieves the imperiat and inert Clef, and Gregor survives in a damaged, mute state.

Afterward, Dandolo forces seize the Commons and arrest Orso. He escapes execution by revealing that he has founded a new merchant house, Foundryside Limited, with the Scrappers. Sancia arrives at its headquarters, reveals that Gregor is alive and hidden, and asks Orso to help repair Clef. Elsewhere, Ofelia consults her moth-shrouded prophet, who declares that the real war is beginning and that it is time to stop hiding.