Detective Superintendent Pierre Niemans, portrayed by Jean Reno, is sent to the isolated university town of Guernon nestled in the picturesque French Alps to investigate a horrific murder that has shaken the academic community to its core. The victim, Professor Remy Callois, a highly respected scholar and custodian of the university's secrets, has been found brutally murdered, his eyes cruelly removed. As Niemans begins to untangle the threads of this chilling case, he consults with Dr. Cherneze, played by Jean-Pierre Cassel, an ophthalmologist who sheds light on the dark legacy of inbreeding among the faculty members, a consequence of their seclusion and misguided obsession with intellectual elitism.
Meanwhile, in the neighboring town of Sarzac, Detective Inspector Max Kerkerian, brought to life by Vincent Cassel, finds himself investigating a perplexing series of events surrounding the desecration of the grave of Judith Herault, a young girl who perished in 1982. The mystery deepens as photographs of her are mysteriously stolen from the local primary school. As Niemans intensifies his inquiry, he becomes enmeshed in a sinister conspiracy that could be linked to the faculty’s medical establishment in Guernon.
His investigation takes a twist when he encounters Fanny Ferreira, a glaciologist entangled in her own secrets. As Niemans rummages through the late librarian’s office, he uncovers a chilling archive detailing the original faculty's malevolent intentions to forge a super-race through intellectual selection, bypassing physical criteria altogether. This shocking revelation hints that their inbreeding practices were not mere accidents, but rather a calculated effort to engineer a so-called "superior" being.
As Niemans and Kerkerian's paths converge, they stumble upon a second victim, killed in a similarly ritualistic manner as Callois, this time discovered within the icy depths of a glacier. The glassy eyes of the unfortunate soul send chills down their spines, solidifying their understanding that the perpetrator is not an ordinary murderer, but someone far more dangerous.
Tension escalates when Niemans rendezvous with Kerkerian at the residence of the latest victim, only to realize he has been inadvertently lured deeper into the enigma. As they piece together the puzzle, they uncover that the fingerprints on Niemans' firearm belong to none other than Judith Herault herself. The game intensifies, and the stakes soar to alarming heights.
Navigating the treacherous mountain roads to reach Fanny's residence, the duo narrowly avoids disaster thanks to the reckless driving of the Dean's wayward son. Their minds race with the dark truths being unveiled: the university's covert breeding program, which had been swapping healthy village children for those of faculty members burdened by genetic deformities from generations of inbreeding. The faculty's medical professionals had unwittingly participated, with Callois’ meticulous planning paving the way for these morally bankrupt arrangements.
The deeper they delve, the more chilling the implications become. Sertys must have switched Fanny with one of the deceased faculty babies, while her identical twin sister, Judith, was left with their family as a control subject. After Judith's recent hospital stay due to a broken wrist, her mother recognizes an uncanny likeness between Judith and Fanny, leading to a desperate escape from the hospital, pursued by the very faculty members who precipitated a tragic accident claiming her husband’s life.
As her grasp on reality weakens, the mother finds sanctuary in adopting the somber attire of a nun, while Judith becomes voraciously intent on reclaiming Fanny. The unearthed remnants of horrors—the hands and eyes of the program's victims—discovered hidden in Fanny’s basement, ominously amplify their dawning comprehension of the lurking evils.
In a climactic moment, as chaos reigns, Niemans takes charge, ordering an evacuation of the university as he and Kerkerian embark on a treacherous journey up the mountain to find Fanny. However, a shocking confrontation awaits them—Judith, in her terrifying intensity, commands Fanny to eliminate Niemans. The clash escalates into a chaotic gunfight that triggers an avalanche, burying all parties beneath the snow's relentless embrace. As the flurry settles, so do the fates of those involved, precariously awaiting the arrival of rescuers amidst the silent aftermath.
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