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?
| Actor | Role |
|---|---|
 Parambrata ChatterjeeSatyanweshi Byomkesh | Satyanweshi Byomkesh |
 Rudranil GhoshAjit Bandyopadhyay | Ajit Bandyopadhyay |
 Anjan DuttRavi Burma | Ravi Burma |
 Gargee RoyChowdhurySukumari Chowdhury | Sukumari Chowdhury |
 Sumanta MukherjeeMinister Santosh Samadder | Minister Santosh Samadder |
 Suprobhat DasUday | Uday |
 Swaroopa GhoshChameli, Santoshʼs wife | Chameli, Santoshʼs wife |
 Ayoshi TalukdarHenna Mallick | Henna Mallick |
 Madhurima BasakSatyabati | Satyabati |
 Soumendra BhattacharyaNengti | Nengti |
 Tribikram GhoshNot listed | Not listed |
| PPannalal GhoshNot listed | Not listed |