A grieving couple retreats to their cabin deep in the woods, dubbed "Eden," after the tragic death of their young son. The mother is deeply affected by inconsolable grief and has been hospitalized following the incident. Intent on healing, the father, a therapist, takes it upon himself to treat his wife's debilitating sorrow and fear through exposure therapy, applying his professional skills to aid her recovery. The dense, primeval forest around them, once a place of refuge and solace, begins to mirror their inner turmoil and mental states, setting the stage for their attempts to come to terms with their loss and pain.

As they delve deeper into the therapy sessions, the couple's relationship undergoes intense scrutiny, with the natural surroundings taking on a more menacing and eerie character. The husband's efforts to help his wife confront her fears and grief head-on lead them to confront not only the devastating loss of their child but also the darkest corners of nature and human psyche. The forest, once a place of beauty, becomes a labyrinth of terror and mysterious forces, reflecting the couple's fracturing reality and pushing their emotional and psychological boundaries to the limit.