Felicia lives a rather ordinary life until one fatal accident changes everything. Reeling from the death of her twin sister, Carrie, Felicia desperately attempts to connect to her, vowing to live the life her sister was denied by forcing herself to closely mimic Carrie.
Feeling more alone than ever in a house that's become a morgue, Felicia can't believe her luck when she accidentally stumbles upon Carrie's hidden diary. In her efforts to transform herself into the ethereal Carrie, Felicia's life begins to spiral out of control.
Confronted by her parents' troubled marriage, a breakup with her best friend, and an overwhelming sense of isolation, Felicia's solitariness becomes more of a danger than she could have ever imagined, and the fight to survive is grueling.