Urbanski protests that the envelope belongs to Fulsom. Agent Pendergast, Chambers’s partner, suggests that Estevez examine it privately. Estevez orders everyone into his office. He tells Pendergast that since Mike Decker, an FBI agent and friend, recommended him, he will give him a chance to explain himself. Pendergast reveals that he witnessed a suspicious garage meeting between Urbanski and Fulsom and approached Fulsom with a scheme to impersonate a corrupt lawyer at their subsequent lunch in LaPlace. He learned that Fulsom was worried about an incriminating videotape from an FBI sting involving sex trafficking. Urbanski had agreed to retrieve the tape from the evidence room for $50,000. Pendergast states that the videotape is in the envelope, along with Polaroid photos documenting the exchange.

Estevez is furious at the unauthorized sting. Pendergast argues that the evidence was obtained legally on federal property. Chambers unexpectedly speaks up, falsely claiming that he approved the operation as senior agent.

Pendergast raises an eyebrow at Chambers’s lie. Chambers continues, telling Estevez that he authorized the operation because morale has declined under Urbanski. Fulsom threatens to sue if the envelope is opened. Defying the threat, Estevez tears it open, revealing a videotape with an FBI evidence tag. He summons two agents and has Fulsom and Urbanski arrested, reciting Miranda warnings. Chambers formally takes responsibility for Pendergast’s actions.

Estevez reveals that Decker told him that Pendergast has authority issues, which is why he assigned him to the open-minded Chambers. He expresses hope that this incident might help Chambers become a good agent again. However, he threatens both with career-ending consequences if they pull another “stunt” and bars them from the building for at least seven days, ordering them to find something to investigate far from the office.

Outside the field office, Pendergast directs Chambers to a Japanese tea shop in Faubourg Delassize. Pendergast notes that the robin’s-egg blue of Chambers’s Impala reminds him of a Magritte painting. When Chambers correctly guesses that he’s thinking of The Empire of Light, Pendergast is surprised. At the tea shop, Pendergast orders in fluent Japanese. He apologizes for the incident and thanks Chambers for intervening. Chambers apologizes for being a poor mentor and receives Pendergast’s sympathies for his wife’s death.

Pendergast asks about the Magritte reference. Chambers explains that his late wife, Janice, taught art history and loved Magritte; he bought the car as a surprise for her but received word of her death before she could see it. When asked how he knew Urbanski was corrupt, Pendergast cryptically replies that “some things [he] just know[s]” (56). For the first time in months, Chambers feels his depression recede. Pendergast opens the envelope from Malone, which contains a newspaper article about a bizarre unsolved murder in Diamondhead, Mississippi. He suggests investigating the case to fulfill Estevez’s orders. Chambers agrees.

Driving east toward Mississippi, Pendergast reads from the article. A body was found in a storage unit with one arm amputated. Chambers begins feeling like himself again. They pass the Grand-Morte Swamp, which Pendergast knows as the Ghost Swamp. Chambers recounts the local legend of the town of Frenier and the Creole priestess Julie Brown, who cursed the town before a hurricane swallowed it in 1921; her body supposedly “glowed yellow as the moon […] before she sank beneath the wind and waves” (59). Pendergast offers a scientific explanation: Ingesting phosphorus-laden match heads as a means of suicide caused a ghostly glow. Observing Chambers’s unease regarding the swamp, Pendergast cites Edith Wharton to the effect that it is possible not to believe in ghosts but still fear them.

Pendergast radios ahead to Diamondhead law enforcement. At the southern Hancock County sheriff’s department, Deputy Willis meets them. Pendergast takes the lead in the interview. Willis explains that on August 5, two girls witnessed a man in a hospital gown run out of the swamp and across Chef Menteur Highway near the Old Pearl River. A man in a black sweatshirt chased him down and forced him back into a white van. The girls provided few details, and an APB on the van has yielded no results. The storage unit was rented under a false name and paid for in cash. The victim, Kenneth Drakos, was running north when recaptured.

They view Drakos’s body in the morgue. Chambers observes signs of strangulation and notes that a tourniquet was used on the severed right arm, which is heavily mutilated, while the rest of the body is relatively unharmed. Pendergast conducts a lengthy examination using a magnifying glass. On the drive back, he shares his conclusions: The killer, who has some sort of mental illness, is experienced and well-funded, with surgical training. He has killed many times before and likely has a safe house, but he does not kill for the typical reasons serial killers do. The fundamental mystery is why the killer amputated the arm with surgical precision but then mutilated it.

Proctor remains imprisoned in the padded cell. Unafraid, he has systematically familiarized himself with the cell’s dimensions in darkness and maintains a rigorous exercise routine. He deduces that he is in a basement and that previous captives have been held here. The lights activate, and his captor speaks through the food slot, praising Proctor’s compliance. The meal is more substantial: grilled filet, carrots, pancakes, and Jell-O. The captor instructs Proctor to take a multivitamin and antibiotic tablets, threatening punishment for refusal. Proctor recognizes the man’s talkativeness as a “weakness.” Recalling the captor’s “slavering expression” and obsessive focus on his health and diet, Proctor grows increasingly suspicious that his captor has a cannibalistic purpose for keeping him alive. Meanwhile, the captor remarks on Proctor’s unusual stoicism, noting that Proctor has not pleaded, offered money, or asked questions.

The next morning, Chambers wakes after a “miserable night,” though for the first time in months, he kept his gun locked away. A uniformed chauffeur arrives, sent by Pendergast, and drives Chambers in a vintage Rolls-Royce to Pendergast’s residence in St. Charles Parish. The car travels through “sleepy byways […] where the trees hung thick with Spanish moss and ancient mansions could be glimpsed past ancient tree trunks, set among dark bayous and old, private family cemeteries” (73). They arrive at a grand, pillared plantation house with two IBM trucks parked outside, their equipment—including a large satellite dish and thick cables—running into the building. Pendergast, dressed in his customary black suit, greets Chambers at the door.

Pendergast welcomes Chambers to Penumbra Plantation and identifies his car as a 1959 Silver Wraith. He confirms his genuine interest in the Drakos case. Pendergast shows Chambers their temporary base: a den where IBM technicians are installing computers with a T-1 line. Mike Decker arranged for them to access FBI databases remotely. A household worker named Maurice serves them lemonade. Pendergast proposes searching for similar unsolved homicides from the past five years involving cutting or amputation within a 30-mile radius of the abduction site.

They spend hours searching with limited success. During lunch on the veranda, Pendergast questions the assumption that Drakos escaped from the van. He posits an alternative: Drakos escaped from a place of confinement south of the highway and was intercepted by the killer, who used the van to cut off his escape route. Chambers is skeptical, arguing that the area has been an uninhabitable swamp since the 1921 hurricane. Pendergast suggests obtaining historical maps and aerial photographs. Chambers agrees to make the calls.

Back at the computers, Chambers widens his search across three states. He finds a potential connection: a cold case involving gangster Jimmy Socks, whose decomposed body was found in Bayou Gauche, missing an arm and both legs. A severed arm was discovered in a dumpster in Gadsden, Alabama, several days before the body was found. The arm was missing its hand, preventing fingerprint identification. Pendergast notes similar clean, surgical cuts on both arm and torso, plus possible freezer burn. Chambers remains skeptical due to low screen resolution and lack of physical evidence—the body was cremated and the arm likely disposed of. Pendergast suggests visiting the Diamondhead storage facility the next day.

The next morning, Chambers drives them to the run-down Haul-U-All Self Storage facility. They meet the uncooperative owner, Rockelton, who confirms that he found Drakos’s body after noticing the unit’s door was slightly ajar. The unit is rented under the name Jack Daniel with annual cash payments dropped through the mail slot. Rockelton refuses to open the unit without a court order. Chambers takes over, fabricating a story that the property is a toxic former munitions factory and tuberculosis cemetery, threatening to expose it to a journalist. The blackmail works. In the car afterward, Pendergast expresses admiration for Chambers’s interrogation methods. Chambers advises Pendergast to be less deferential.

Rockelton opens the unit and departs. The space is set up like a surgical area, with a blood-stained metal table and floor, well stocked with new hospital gowns and surgical supplies. Chambers concludes that CSI processed the scene thoroughly but found no fingerprints. The killer was methodical but left in a hurry, indicating a serial killer who planned long-term use of the site. Pendergast begins his own minute examination with a magnifying glass. After half an hour, he asks Chambers to lie on the bloody table in the victim’s position. Chambers angrily refuses, so Pendergast lies on the table himself, explaining that it is a concentration exercise requiring 40 to 45 minutes. A disgusted Chambers leaves to wait in the car.

Nearly an hour later, Pendergast returns. Chambers confronts him about his wealth, connections, and bizarre behavior. Pendergast explains that he was part of a “highly classified military unit” with Mike Decker, which led to his interest in law enforcement (97). He describes lying on the table as part of Chongg Ran, a Tibetan meditation requiring physical presence at the event’s location. He shares his conclusions: Drakos ran at least five miles through the swamp, indicating that both victim and killer were extremely fit. The killer knew that he was seen by the girls, which caused him to rush the procedure. Something happened after the amputation that sent the killer into a rage, causing him to slash the arm and flee in panic. Pendergast theorizes that the killer’s sole interest was the right arm, that he does not enjoy killing, and that he is a “seeker” searching for something.