Pari opens with Arnab (Parambrata Chatterjee) subjecting himself to an arrangement set-up. Unfortunately on their way back, their car, driven by his father, hits an old woman and instantly kills her. On conducting further investigations, the cops reach the deceased woman's house in the forest where they discover Rukshana (Anushka Sharma) chained and battered. Feeling pity on her sorry state, Arnab decides to offer refuge to her. But beware, this isn't a fairy tale! Will Arnab realise this before it's too late?