The Atlantis Complex (artemis Fowl, #7)

The seventh installment in the Artemis Fowl series opens with a prologue recounting how Artemis Fowl II, the son of a powerful Irish crime lord, once kidnapped Captain Holly Short, the first female captain in the history of LEPrecon (the Lower Elements Police Reconnaissance Unit, an elite fairy police squad), and ransomed her for gold. Over subsequent adventures, the two developed a wary friendship. The prologue closes ominously: A shadow has fallen across Artemis's mind, and he now sees things that are not there.

On the Vatnajökull glacier in Iceland, fifteen-year-old Artemis prepares to present a world-saving project to fairy representatives: Captain Holly, the centaur technical consultant Foaly, and Commander Raine Vinyáya of LEPgeneral, the fairy police command division. He has arrived alone, having sent his bodyguard Butler away on a supposed rescue mission. His behavior is alarming: He obsessively taps objects, counts words, and fixates on the number five while dreading the number four. Holly and Foaly privately suspect he has the Atlantis Complex, a fairy psychosis common among guilt-ridden criminals, characterized by obsessive-compulsive behavior, paranoia, delusions, and multiple personality disorder.

Artemis presents his plan to combat global warming using biodegradable nano-wafers that coat glaciers with a reflective insulating layer, deployed from fairy shuttles. Before he can demonstrate his prototype cannon, the Ice Cube, sensors detect a massive craft: one of Foaly's own deep-space probes, originally designed for a Mars mission, now plummeting toward them. The probe fires a plasma beam that destroys the LEP shuttle, killing all marines aboard, and Commander Vinyáya sustains fatal injuries. Holly is thrown onto the restaurant roof, breaking her pelvis and ankle, but she saves Artemis by shooting him clear with a concussive blast from her Neutrino pistol as he walks toward the descending probe, convinced it is a hallucination.

A parallel storyline follows Butler to Cancún, Mexico. He received a distress message apparently from his younger sister Juliet, who wrestles professionally, and Artemis insisted he go. Butler arrives to find Juliet safe; the message was fabricated. A fairy mesmerist then hijacks the arena's screens, commanding the mesmerized audience to kill Butler and Juliet. Juliet destroys the screen, breaking the spell, and Butler concludes someone separated him from Artemis deliberately.

Holly's concussive blast triggers the second stage of Artemis's Atlantis Complex. When he wakes, he introduces himself as Orion, a chivalrous, romantic alternate personality free from the number obsessions but hopelessly impractical. Meanwhile, the probe releases its amorphobots, biosphere machines originally designed to collect organic samples but now reprogrammed as weapons that hunt by heat signature. Holly masks the group's heat signatures using nano-wafers from the Ice Cube, and the bots follow the probe underground.

The narrative introduces the true villain: Turnball Root, a disgraced former LEP captain and older brother of the late Commander Julius Root, imprisoned in the Deeps, a maximum security prison in Atlantis. Turnball has spent years secretly enslaving his guard Vishby, a water elf, with a thrall rune, a black-magic symbol that binds the victim's will. Through Vishby, he obtained a stolen control orb from the defunct Koboi Laboratories and used it to reprogram the probe. Turnball monitored Commander Vinyáya's communications, since Vinyáya was the prison warden's sister, and redirected the probe to kill her troops. He also orchestrated the mesmer attack on the Butlers. His motive is personal: His human wife Leonor is aging rapidly, and he needs to escape prison to save her.

Holly, Foaly, and Orion find the shuttle's escape pod and follow the probe toward Atlantis. Holly's warning reaches Commander Trouble Kelp at Police Plaza, who orders the city evacuated. During the evacuation, Turnball executes his prison break. His followers, including his lieutenant Unix and the dwarfs Bobb Ragby and Ching Mayle, are aboard the same prison shuttle. When the probe crashes into the shuttle, the LEP presumes everyone dead, but Turnball's reprogrammed amorphobots merge into a gel entity that extracts his crew moments before impact. Turnball's endgame becomes clear: The crisis is designed to draw the demon warlock N°1, the most powerful magical being alive, out of Haven City to treat wounded aboard the hospital ship Nostremius. Turnball intends to capture N°1 and use the warlock's magic to restore Leonor's youth.

Meanwhile, Mulch Diggums, a dwarf criminal and old friend of Artemis and Holly, intercepts a kill order for the Butlers at a dwarf bar in Miami and infiltrates the mercenary squad sent to execute it. Butler and Mulch subdue the mercenaries, collect Juliet, and fly to find Artemis. The group reunites in the North Atlantic. Artemis regains control of his mind after being electrocuted by a guard. He deduces that Turnball Root orchestrated the attacks and, after recovering an amorphobot core from the seabed, confirms Turnball used the gel robots to fake his death. Holly calls Artemis's mother Angeline, who makes Artemis promise to call her "Mum."

Following the dissolving gel trail into the Mediterranean, the group tracks Turnball to Venice, where the amorphobots ambush and capture them all, delivering them to Turnball's stolen shuttle ambulance moored to the Nostremius. Turnball brands Holly with a thrall rune, enslaving her will, and sends her to lure N°1 from the hospital ship. He also brands Artemis. Trapped in an amorphobot, Artemis deliberately provokes guard Ragby into electrocuting him. The shock triggers his Atlantis Complex, bringing Orion to the surface. Because the rune controls Artemis's mind but not Orion's separate personality, Orion is free to act. Simultaneously, Mulch ignites a buildup of dwarf gas to burst his amorphobot, and Foaly uses the recovered bot core to dissolve the remaining gel restraints, freeing Butler and Juliet.

In the umbilical conduit connecting the ambulance to the Nostremius, a final confrontation unfolds. The enthralled Holly takes down Juliet, and Turnball shoots Butler with a sedative gun. Orion, however, disarms Turnball using techniques absorbed from Butler's training while sharing Artemis's consciousness, then shoots Holly with the knockout gun. Turnball reveals the ambulance is rigged to explode, but his escape plan has collapsed because Foaly dissolved the amorphobots. His wife Leonor appears in the doorway, frail and ancient, the thrall rune's hold on her finally faded. Seeing clearly for the first time in decades, she refuses to let others die and insists on piloting the ambulance into the deep trench alone, calling it a chance to finally fly, something Turnball had secretly prevented for decades. Unable to face life without her, Turnball follows Leonor aboard. The ambulance dives into the Atlantis Trench and explodes deep underwater.

In the epilogue, Artemis wakes in the Nostremius hospital. He admits the Atlantis Complex is not cured and agrees to extended therapy at Dr. Argon's fairy psychiatric clinic. He reflects that this adventure was different: Many innocents died, no one truly won, and Turnball's motivations were rooted in love rather than villainy. Holly reminds him that N°1 and everyone on the hospital ship survived because of their efforts. Butler calls Angeline to tell her Artemis has developed a mental condition; she is distraught but resolves to come immediately. The novel closes with Butler heading to the gymnasium, where Juliet is hustling a jumbo pixie in a wrestling match and Mulch is raiding the galley, a note of normalcy as Artemis faces a long road to recovery.