The Thirst (harry Hole, #11)

The eleventh installment in Jo Nesbø's Harry Hole series opens with an unnamed figure emerging from hiding after three years, retrieving a revolver, an iron contraption, and instructions from a locker at a Turkish bathhouse in Oslo. Meanwhile, Harry Hole, a former murder detective now lecturing at the Norwegian Police College, wakes from a recurring nightmare about a killer who escaped him years ago. Harry lives contentedly in Holmenkollen with his wife, Rakel, having been sober for years. His stepson, Oleg, is enrolled at Police College.

At the Jealousy Bar in Grünerløkka, bartender Mehmet Kalak observes a failed Tinder date involving lawyer Elise Hermansen. That night, Elise returns to her flat, locks the security chain, and is attacked by someone already waiting inside. The intruder reveals a demon tattoo on his chest, inserts iron teeth into his mouth, and bites through her carotid artery. Detective Inspector Katrine Bratt, newly appointed lead detective at Crime Squad, examines the scene and deduces from splinters and scratches on the security chain that the killer entered before Elise arrived. Forensics expert Bjørn Holm, Katrine's recently estranged partner, identifies bite marks consistent with iron dentures and notes that roughly half a litre of blood is missing.

Police Chief Mikael Bellman visits Harry and tries to blackmail him into investigating the case, threatening to expose Oleg's past involvement with heroin, which would end his police career. Harry refuses, but crime-scene photographs trigger an unsettling recognition. When a second Tinder user, Ewa Dolmen, is murdered in her Tøyen flat with the same iron teeth and a "V" painted in blood on her door, Harry agrees to take the case. He assembles a small team in the "boiler room," a basement office beneath Police HQ, recruiting Bjørn, young detective Anders Wyller, and psychologist Hallstein Smith. Smith has devoted his career to studying clinical vampirism, or Renfield's syndrome, a disorder involving the compulsive ingestion of blood.

The demon tattoo, the "V," and the staging convince Harry that the killer is Valentin Gjertsen, an escaped sex offender and serial killer who faked his own death in prison nearly four years earlier and underwent extensive plastic surgery. Valentin strikes again, attacking Penelope Rasch in her apartment stairwell after a failed Tinder date. Truls Berntsen, a constable transferred to Crime Squad by his childhood friend Bellman, arrives in time for Penelope to survive. DNA from the scene confirms Valentin as the attacker, and Katrine announces his identity on national television.

Tensions build when VG journalist Mona Daa publishes leaked case details. Katrine suspects Berntsen and tasks Wyller with confirming the leak, which he does, though Bellman shields Berntsen from consequences. Meanwhile, Rakel begins experiencing mysterious symptoms and is hospitalized at Ullevål under haematologist John D. Steffens, who places her in a medically induced coma when her kidneys fail. Steffens tells Harry her chances of survival are below 50 percent. Harry continues working the case, causing friction with Oleg, who accuses him of prioritizing work over Rakel.

Harry secretly stations Mehmet at the Turkish bathhouse Valentin frequents, hoping the bartender can identify Valentin's altered face. Mehmet spots him, but Valentin escapes. After VG publishes enough identifying detail about the police's civilian informant, Valentin kills Mehmet at the Jealousy Bar by draining his blood through a metal tube inserted into his carotid artery. Valentin also abducts Marte Ruud, a waitress at Harry's regular bar, leaving a "V" at Harry's usual table as a personal taunt. Penelope Rasch is subsequently murdered in the hospital by someone posing as her former fiancé. Aurora Aune, the 15-year-old daughter of Harry's psychologist friend Ståle Aune, reveals that Valentin raped her three years earlier and threatened to kill her father if she told anyone. Overwhelmed, Harry breaks his sobriety.

Bjørn discovers a cashpoint receipt in a coat Valentin left at the bathhouse. Aurora, the only living person who has seen Valentin's surgically altered face, identifies him from ATM security footage. The bank card traces to the alias Alexander Dreyer, a man who died in 2010. A tactical raid on Dreyer's flat recovers the iron teeth and evidence linking Valentin to Marte Ruud, but Valentin has fled. That night, Valentin breaks into Smith's barn office. Smith shoots him once, and Valentin flees into the fields during a storm. Harry pursues him to a dilapidated shack, where Valentin raises what Harry mistakes for a weapon. Harry fires three times, killing him. Before dying, Valentin makes cryptic remarks suggesting someone else has been manipulating them both.

Rakel eventually wakes from her coma, and Harry reconciles with Oleg. Months later, Berntsen, while archiving closed files, notices that a reclusive IT engineer named Lenny Hell had been in contact with both Elise and Ewa. Berntsen brings the files to Harry rather than to Bellman, who is preparing to become Justice Minister and would suppress complications. Harry visits Hell's isolated farmhouse with Smith and the local sheriff. They find Hell dead, shot with a bolt gun, and Marte Ruud's body in a cellar cage. Upstairs lie Smith's stolen patient records and emails revealing that someone directed Valentin to kill specific women.

Harry grows suspicious. Security footage shows the revolver was already in Smith's office before Valentin arrived, meaning Smith placed it there. Harry also recalls that Smith ducked under a low water pipe in Hell's cellar on what was supposedly his first visit, revealing prior familiarity. Harry pieces together the truth: Smith was the mastermind. Through therapy sessions in which Valentin used the alias Alexander Dreyer and described vampiristic fantasies, Smith identified a willing killer. Smith kidnapped Hell, chained him in his own cellar as a living alibi, and used Hell's computer to send Valentin targets and copied keys. Smith's motive was to engineer real-world laboratory conditions for his doctoral dissertation on vampirism.

Lacking admissible evidence, Harry devises a plan to extract a confession at Smith's doctoral disputation, a formal oral defense at the University of Oslo. From the audience, Harry presents his deductions and fabricates forensic claims, bluffing Smith into believing the evidence is irrefutable. Smith, unable to resist defending his achievement, confesses publicly, declaring the murders justified for scientific progress. Smith grabs the revolver from a display table and takes Ulla Bellman, the police chief's wife, hostage. Berntsen walks toward Smith unarmed and is shot in the chest. Harry offers himself as a replacement hostage. Smith drives off in Bjørn's car with Harry handcuffed beside him, heading for a boathouse on Nesøya island. Harry, who secretly placed the iron teeth in his mouth before donning the handcuffs, bites into Smith's wrist and throat, disabling him. Smith crashes the car into the boathouse. Harry overpowers Smith, who dies from his injuries. Harry fires the revolver to attract rescue, and Delta officers retrieve him.

In the aftermath, Berntsen survives surgery. Harry co-owns the Jealousy Bar in Mehmet's memory, with his old friend Øystein Eikeland tending bar. Katrine and Bjørn reunite and expect a child. The novel closes, however, with a new threat: Svein Finne, a 75-year-old serial rapist known by the criminal nickname "the Fiancé," visits Valentin's grave. Finne, revealed to be Valentin's biological father, finds items in a gym locker left by an unknown contact: a key, an address in Holmenkollen, and a set of iron teeth. He puts the teeth in his mouth, setting up the next installment.