In a sun-baked desert, a disheveled man works as the gatekeeper of a level crossing, living alone in a remote dwelling. One day, he finds an unconscious woman and carries her to his home. When she comes to, she explains she fell from a train. Feeling unsafe, she tries to leave, but collapses again as she heads toward the horizon.
The man tends to her and introduces himself as Raghu. With no other option, she stays the night. The next morning, when Raghu offers to contact the railway authorities, she refuses. Introducing herself as Chaithali, a psychiatrist, she begins to recount her troubled past and her marriage to a man named Zincho.
Chaithali explains that Zincho had sought therapy after his first wife's suicide. They fell in love and married, but she later discovered that Zincho struggled with substance abuse and became abusive. He was admitted to a mental asylum. He killed the matron to escape and later caught Chaithali reading his diary, which revealed he had killed his first wife. Fleeing together, Chaithali jumped off the train.
Raghu shares his own story. He grew up with his mother, who had wished for him to marry. He never took it seriously, and after her death, he lived in regret and isolation. Raghu believes fate brought Chaithali to him. Chaithali begins to trust him, and Raghu finds happiness in her companionship.
While Chaithali cleans the house during Raghu's absence, she finds his identity card with a different man's photo, alongside newspaper clippings about a murder involving a family of four. When Raghu returns, he notices her frightened demeanor and tries to console her but discovers the identity card she inadvertently left behind. She holds a knife at him. He disarms her and shares more about his past.
Raghu tells her that he had a girlfriend from childhood who dumped him for a wealthy suitor. Fulfilling his mother's wish, he entered into an arranged marriage. His wife invited her cousin to stay with them. Their marriage produced two children. Two years later, during a hospital visit for a vasectomy, Raghu discovered he had been infertile. Upon returning home, he found his wife in bed with the man pretending to be her cousin. Enraged, Raghu killed them and their children. He suspected his wife had also killed his mother to make way for her affair. He fled and assumed the identity of another man—the original Raghu—who had offered him refuge before dying.
As they share their pasts, their mutual sense of isolation draws them closer, and Chaithali decides to live with him. Raghu sends her to fetch water from an abandoned village whose inhabitants, according to legend, fled in fear of a creature that walked upside down.
While Chaithali is away, Raghu senses someone lurking outside. It is [Zincho], who asks if Raghu has seen anyone in need of help. Sensing danger, Raghu lies. A fight ensues and Zincho overpowers Raghu. Zincho explains that he is a psychiatrist, and Chaithali, whom he calls Shikha, was his patient. They had fallen in love, but she was a drug addict who lost her sanity and killed the asylum's matron, adopting her name. Zincho warns Raghu that Shikha is a dangerous psychopath and that his life is at risk.
Raghu confronts Chaithali. She claims Shikha was Zincho's first wife. Unable to convince him, she surrenders to her husband. As they walk away, Raghu pleads with Zincho to let her stay. While Zincho is distracted, Chaithali strikes him, causing him to collapse, seemingly dead. When Zincho stirs, Raghu bludgeons him to death, assuring Chaithali of his trust.
Raghu discovers a medical bill in Zincho's pocket, confirming that he was indeed a psychiatrist and that Shikha was his patient. Before Raghu can react, Shikha strikes him with a shovel. The next scene shows Raghu, now revealed as George, prepared for another day as a gatekeeper. Shikha is presumably dead. A final flashback reveals that George fabricated his backstory—he was never married and had actually killed the family of his ex-girlfriend.
In the closing scene, something watches George's house from an inverted perspective, accompanied by a low growl—presumably the creature that once terrorized the villagers.
