A Drop of Corruption

Dinios Kol arrives in Yarrowdale to investigate the disappearance of Treasury official Mineti Sujedo. Local warden Tira Malo shows him the preserved remains: only fragments of Sujedo’s body have been recovered, and the evidence proves he was bound, cut apart, and dumped in the canals. The original crime scene makes the case seem impossible. Sujedo had supposedly spent the night in a locked room high in a leaning tower, with a guard outside, locked windows, and no sign of an intruder. Witnesses recall that he looked ill and kept twitching or tapping. Din also learns that Sujedo briefly visited the Treasury bank before vanishing and deposited a suspiciously large bag.

Din’s superior, Immunis Ana Dolabra, reframes the case. Instead of asking how Sujedo escaped a sealed room, she asks whether the man in that room was really Sujedo at all. Comparing witness memories, heights, and behavior, Ana proves that the man who came to Yarrow under Sujedo’s name was an impostor. A second search of the tower reveals how he staged the locked-room disappearance with lodestone and an escape through vacant rooms, then changed clothes while destroying scent traces. Ana concludes that the impersonation’s real purpose was access to the Treasury vault.

At the bank, the investigators discover that the vault was indeed breached, but not in the way they expected. The tampered safe belongs to the Apoths, not the Treasury, and when Immunis Rava Ghrelin opens it, he finds a preserved severed head with a threatening note instead of his confidential materials. The head is identified as Princeps Traukta Kaukole, an Apoth officer who vanished two years earlier with a lost barge, linking the current crime to older smuggling violence. Ana reads the note as a political message, suspects the thief is an Apoth insider, and becomes convinced that the supposedly stolen healing grafts are a cover for something much more dangerous. Ghrelin’s tapping habit also matches the same strange rhythm described in the false Sujedo.

Ana and Din confront the Apoth leadership at the fermentation works, where Commander-Prificto Kulaq Thelenai tries to control the flow of information. Ghrelin’s background on the Shroud and the Apoths’ alarm at references to leviathan marrow convince Ana that they are hiding a secret project. While Din chases a long list of officers with vault access, Malo finds a lead to an old smuggler camp. Din joins a warden raid upriver, accompanied by Malo, Sabudara, and Tangis. Instead of ordinary criminals, they find a devastated camp where about forty people and the landscape itself have been grotesquely transformed by leviathan blood. A fermentation device sits at the center, and a coded message in the same hand as the bank note shows that the killer returned after the disaster to leave a deliberate sign.

Captured smugglers describe serving a masked mastermind they call the Pale King, a figure with a skull-like helm, impossible foreknowledge, and the same tapping habit. At his shrine, Din finds a Yarrow oathcoin that links the smuggling network to the royal court. Back in Yarrowdale, Ana identifies the jungle machine as a degradation diffuser designed to aerosolize altered leviathan blood. When she forces Thelenai and Ghrelin to stop hiding the truth, they reveal a secret imperial project: the Apoths have been trying to preserve leviathan marrow so the Empire can produce kani away from Yarrowdale. Because each leviathan is biologically different, they created augury, an illegal mind-altering graft that makes certain axioms extraordinarily predictive but eventually paranoid, obsessive, and unstable. Ana identifies their missing suspect as Sunus Pyktis, a supposedly dead former Shroud augur.

The danger escalates when King Lalaca dies in the High City and Kardas is arrested for poisoning him. Prince Camak di Lalaca secretly summons Ana, Din, and Malo, fearing Kardas is being framed. In court, they learn Kardas was poisoned as well, which weakens the simple case against him. Ana works through the testimony, showing how the king’s cup could have been tampered with and how Kardas later poisoned himself by touching residue and biting his thumb. Her attention shifts to Signum Gorthaus, Kardas’s engraver, whom she exposes as the Treasury observer who had spent two years feeding precise shipping information to the smugglers during monthly visits to court. Before Gorthaus can identify her contact, she is assassinated with kerel poison inside the palace, proving the conspiracy is still active at the highest level.

Meanwhile, Din goes into the Shroud itself under heavy drugs and warding. There he sees the horrifying living imperial citadel built from leviathan tissue and the unstable marrow sample at the heart of the Apoths’ grand plan. Ghrelin serves as interpreter while Din questions two surviving augurs who once worked with Pyktis. They describe Pyktis as brilliant, secretive, and emotionally unreachable, and they reveal that he maintained a hidden shrine inside the Shroud filled with Yarrow ancestral objects and silver regalia. From this, Din and Ana conclude that Pyktis was likely not merely a Rathras officer but a hidden son of King Lalaca, planted inside the Empire and raised with a royal mission to destroy the Shroud from within.

Darhi, now exposed as the likely court contact, flees with treasury money and the stolen reagents. Din and Malo track him by scent to a remote estate. Their ambush succeeds, aided by an uprising of the naukari servants, but Darhi is killed before he can be questioned. The investigators recover all six stolen reagent crates and a corpse that seems to be Pyktis, marked by blotley welts. For a moment it looks as if the mastermind may already be dead, but Ana has the crates tested and discovers that one was heavily diluted. Pyktis had already hidden enough reagent elsewhere to build a second, much larger weapon. To break through the maze of false patterns, Ana subjects herself to a brutal reagent-assisted trance and finally sees the missing truth.

Ana leads Din, Malo, and the wardens back to the High City. There she springs her trap in the king’s hall after receiving Thelenai’s signal that another hidden device has been found. By using music to provoke an augur’s involuntary tapping, Ana proves that the man ruling as Prince Camak is actually Sunus Pyktis in disguise. Pyktis and Camak were twin brothers. Ana reconstructs the full plot: Pyktis had killed Pavitar’s dogs so they would not detect a scent difference, replaced Camak during a hunting trip, murdered his twin, altered Camak’s body to resemble Pyktis, and preserved it so he could fake his own death while ruling in Camak’s place. He then poisoned the king, framed Darhi as a future scapegoat, silenced Gorthaus, and tried to panic Thelenai into moving the marrow by ship so he could destroy the transport and keep the Empire dependent on Yarrow. When Pyktis’s hidden supporters attack, Din, Malo, Pavitar, and the loyal guards stop them. Pavitar then executes Pyktis himself beside the true Camak’s body.

At the docks, Thelenai reveals that Pyktis’s final diffuser had indeed been hidden inside a water cask meant for the hydricyst, but she removed the key reagent in time. With the immediate threat ended, Thelenai accepts responsibility for concealing augury and causing countless deaths in pursuit of her project. Din arrests her. Ana then collapses into a medically induced sleep. Before doing so, she leaves Din a clue he follows to a book about attempts to restore the Khanum bloodline, leading him to suspect that Ana herself is tied to one of the Empire’s forbidden remaking projects. During her sleep, Din also learns that the lender trapping him in debt has been crippled by an Iudex investigation that Ana quietly encouraged, freeing him to choose his future honestly. When Ana wakes, Din decides not to leave for the Legion after all. He remains with her and the Iudex, accepting that their work is not glorious but necessary, while Yarrow fractures, naukari flee toward the Empire, and the immense hydricyst arrives to begin a dangerous new imperial age.