In 1814, on Serbian soil, a Napoleonic platoon that has been pushed out of the Illyrian Provinces is worn down by hunger and confusion. Two weary soldiers stumble upon a lone rider and her horse, and a sudden feverish plan to strike the animal quickly spirals into a surreal nightmare: the horse shatters into thousands of fragments, releasing a monstrous presence that relentlessly pursues one of the men. The scene abruptly shifts to the present, where a group of Americans far from their homeland arrives in Serbia to carry out a fracking operation deep in the landscape’s quiet, tense corners.
The expedition is led by Emily Toby Poser, who arrives with her partner in work, John Adams, her son, Teddy Maximum Portman, and a cadre of local collaborators, among them Sofija Olivera Perunicic and their mentor, Professor Nicholai. The Americans bring a brash, sometimes condescending energy to the project, joking with the Serbs about their pace and approach, even as Sofija, a biology major, offers insights into DNA sequencing and the possibility of tracking species in the area. The interpersonal tension surfaces early—Teddy reveals a crush on Sofija, and Emily resists the idea of fostering that connection, while John airily quips about the peculiarities of life and the strange ways bodies can grow inside others.
As the fracking proceeds, a troubling find interrupts the routine: a fragment of bloody tissue emerges, followed by the unearthing of a French soldier entangled in a gooey, eggshell-like net. The French soldier’s body bears a disquieting odor, and his incoherent speech hints at a reality beyond ordinary explanation. Sofija and Nicolai take samples, hoping to decode what they’ve uncovered; meanwhile, the discovery becomes more alarming when a knife is used by the soldier in a desperate attempt to end his own life, a moment that culminates in a grotesque transfer as a reptilian parasite leaves the French soldier and enters [John Adams].
The repercussions are swift and brutal. John’s arrival at the cafeteria is marked by a shared sense of foreboding as the same stench follows him, and the others realize something extraordinary has happened. The infected man later dies in a brutal struggle, his body dismantled as the parasite spreads. The mysterious creature then moves from one host to another, and a deadly confrontation ensues with Christian Bruno Veljanovski, who falls in the clash. Sofija, steadfast in her scientific curiosity, posits a sensational theory: the French soldier’s biology shows a symbiotic, egg-like relationship with a creature similar to an argonaut octopus, suggesting an evolutionary reversal that allows the parasite to live and propagate inside male hosts.
As the organism propagates, Danko [Petar Arsic] and his teammate Filip [Boris Lukman] become entwined in the danger. Danko encounters the parasitic entity more directly and is pressed to the brink as the group grapples with what to do next. Emily and Sonja—together with Nicolai—work to navigate both the scientific puzzle and the ethical questions that arise as more men fall under the creature’s influence. The parasite appears to spare women, complicating the team’s plan to contain the threat, while the group debates whether to let Danko endure the burden or to end his life for the broader safety of everyone else.
Nicolai persists in his belief that the creature can be saved or guided to survive, even if it means risking his own life, and he convinces Emily to loosen restrictions to allow him to help. The team’s efforts grow more desperate as more men fall victim to the parasite, and a crucial choice is made to drive the creature toward the lake in the hope of ending the threat without eradicating the possibility of life within an alternate host. As the tale intensifies, the parasite takes another host—Nicolai’s body—terrifying Sonja in the process. In a final, frenzied moment, Sonja stabs at the creature, while Emily urges Sofija and Teddy to run to safety.
The film closes on a haunting, ambiguous note. Years later, Teddy sits in a bath while Sofija stands nearby, and a news broadcast reports a deadly oil-rig accident that has claimed multiple lives. The monster’s true whereabouts remain unsettled, and the final image hints that the entity may have found a reluctant home within Teddy, suggesting a possibility that the threat could endure in a hidden form rather than being completely vanquished. The closing mood is unsettling and unsettled, inviting reflection on the boundaries between science, exploitation, and the unknown that lingers beneath the surface of modern industry.
