A professor's daughter goes missing, which starts a desperate search for her by his family and acquaintances.

It all starts when Mrinmoy Ghosh (Kaushik Sen), the powerful head police officer in Hatimara, Jalpaiguri, known for hunting down Naxal insurgents in his area, is found dead at his residence. Arghya Sen (Prosenjit), a charming middle-aged bachelor, who takes Mrinmoy's son Amartya's art classes, visits their house when the mystery unfolds. On his arrival, he learns that not only has Mrinmoy been killed, but Kaberi Bhattacharya (Srabanti), Mrinmoy's beautiful sister, is also missing! Will the new officer-in-charge, Pritam Singh (Indraneil), be able to help Arghya and Mrinmoy's family track down Kaberi, and decode the clues behind Mrinmoy's murder, in the midst of a politically tumultuous era? Or will the drunk and irresponsible detective Gokul Debnath (Kaushik Ganguly) derail the investigations, and bring unforeseen truths to light?

Ambar Sen, a Bengali comes to Feluda and informs him that he has got threatening mail. Later Mr. Sen is kidnapped. Feluda investigates.