Alone story begins with Sanjana (bipasha) who comes to Kerala to visit her mother who meets with an accident mysteriously. Coming there, she gets reminded of her twin Anjana (bipasha) who is no more. Incidentally, both are conjoined twins and Anjana dies during the separation operation. Sanjana is married to Karan (Karan singh grover). But she starts facing trouble from a spirit and that is of Anjana. What happens after that forms the rest of the story.