In late 19th Century, Bengal Bhubaneswar Chowdhury (Jackie Shroff) is a wealthy and tyrannical Zamidar (Squire). He has two main obsessions: his desperate attempts for an heir, which even his new second wife Jashomati seems unable to deliver; and competing with his regional rivals to produce the most magnificent effigy of a goddess for the annual Durga Puja ceremony. This year he concocts a master plan - why not change the face of the goddess for the most powerful woman on Earth - Queen Victoria. Meantime his two wives Mahomaya and Jashomati try to look out for one another especially as Bhubeneshwar begins to sexually assault his younger wife each night. Traumatised and lonely, Jashomati is dangerously drawn towards the youthful sculptor who has been employed to create the great effigy of Durga, Goddess of destruction.

Gandharva Kumar's arrival disrupts the festival mood of Durga Puja at Ratanlal Babu's house. He captivates the grandchildren of Ratanlal — Babu, Habul, and Tinni — with his magic tricks. Gandharva Kumar then reveals a long-forgotten secret wherein he claims to be heir to the family property of Ratanlal Babu. This creates shock in the entire family and casts gloom, resulting in dramatic incidents.

Marital strife follows when an aging filmmaker meets an actress who bears an uncanny resemblance to his wife in her younger days.

Based on the novel Magno Mainak by Sharadindu Bandyopadhyay, the film portrays the iconic Bengali detective Byomkesh Bakshi along with his friend Ajit Bandyopadhyay as he investigates the murder of a Pakistani spy named Heena Mallick. He begins the investigation at the request of a political leader, Mr. Santosh Samaddar, who was a close friend of Heena's parents and had given her shelter after her parents' death. Will Byomkesh succeed?