Pari: Not a Fairy Tale is a supernatural horror film that revolves around a kind-hearted man named Arnab (Parambrata Chatterjee), who is all set to marry Piyali (Ritabhari Chakraborty). His life changes when he accidentally hits an old woman and finds her daughter Rukhsana (Anushka Sharma) who was chained in an old hut in the forest. He decides to help Rukhsana who seems to be a victim of abuse. However, the mysterious occurrences in his house make him realize that things are not as they appear to be. Will Arnab succeed in solving the mystery or succumb to it?