The devil's greatest trick is to persuade us that he does not exist.
After the death of her father in Argentina, Elza returns to Brazil to see her remaining family. When visiting her mother's grave, she steals a flower off an unknown grave and put it in her mother's. After that, she begins to receive strange phone calls, from an unknown voice that claims: "Give back my flower!". She becomes terrified and obsessed with the stranger's voice, and starts believing that it's the spirit of the deceased.
