Ammu thought marriage was a fairy tale - full of love and magic. But, it all changed when her cop-husband Ravi hit her for the very first time. What Ammu thought was a one-off incident turned into a never-ending cycle of abuse. Thirteen months later, nothing changed. Ammu realized her marriage was a cautionary tale - full of lies and malice. Trapped and isolated by her manipulative and controlling husband, Ammu decides it was time for payback. Enter Prabhu, a double murderer out on parole. Through a series of fortunate events, Ammu and Prabhu find allies in each other. United by their mutual hate for Ravi, Ammu secretly harbours Prabhu in their home, leaving Ravi frantically looking for the convict on the run. Ammu, with the help of Prabhu, lays a strategic trap to catch and expose her husband who has been hiding under the mask of "a perfect man and a perfect husband". With Ravi on the prowl, Ammu fights against power and patriarchy to break free. Creatively Produced by Karthik Subbaraj, Ammu is a story of resilience, courage and grit.