The film opens with a tragic prologue in a snowy apartment as a grief-stricken young couple, known only as He and She, make passionate love. While distracted, their toddler son, Nick, climbs onto a snowy window sill, spots a toy, and falls to his death. This cataclysmic event shatters the couple's reality. The woman descends into a profound, catatonic depression, paralyzed by grief and guilt.Her husband, a therapist who firmly believes he can cure her condition through professional detachment and cognitive exposure, rejects medication and psychiatric hospitalization. Driven by a mix of genuine love, professional arrogance, and a desire to control the chaos, he takes her to Eden, their
secluded cabin in the deep woods where the tragedy originally began to take root in her subconscious. His therapeutic strategy involves forcing her to confront her deepest fears—specifically nature, the forest, and her phobia of the cabin itself—convinced that facing these terrors will shatter her
psychological paralysis.As the days pass in the isolated forest, the therapy takes a horrifying turn. Instead of healing, the woman grows increasingly erratic, tormented by a pervasive sense of dread and a belief that nature is inherently malicious, governed by Satan rather than God. The husband attempts to maintain his clinical objectivity, mapping her anxieties and forcing logical dialogues, but his rational worldview begins to fracture. Strange, visceral occurrences plague them: weeping trees, violent acorns pelting the roof, and dead animals crawling from the earth.Beneath the psychological experiment lies a toxic dynamic of blame. The woman harbors intense, buried guilt over her child's death, realizing too late that she had unintentionally placed Nick in danger on the day he died. As her guilt metastasizes into violent delirium, the husband discovers historical notes and journals revealing that she spent the previous summer obsessively researching the historical persecution of women, convincing herself that nature is a domain of female subjugation and original sin.The power dynamic violently flips when the therapy fully collapses. The woman attacks her husband, crippling him. What follows is a brutal physical and psychological descent into torture, grief, and mutilation as the line between reality, nightmare, and primal madness dissolves entirely. She subjects him to horrific acts of violence, driven by a tortured need to purge her sins and reclaim her suffering. Eventually, regaining a desperate upper hand, the husband kills her. The film concludes as he burns her body on a pyre and walks alone out of the misty forest, haunted by visions of a faceless multitude of women descending upon the hills.