Alinagarer Golokdhadha

In 1990, the last surviving landlord's valuables are auctioned off to villagers in Murshidabad. A rare sword is bought by Somnath Das for 1000 rupees, a price that belies its historical value. The episode plants the seeds for later confrontations over the sword's provenance and power.

Amirchand Mittal approaches Somnath with a tempting offer of 10 lakh rupees for the sword. Somnath declines, wary of the weapon's political and historical significance. The rebuff foreshadows danger tied to the artifact.

Amirchand is shadowed by goons who kill a police officer, and Somnath becomes an unwitting witness to the crime. The attackers shoot at him, but he survives the assault. He is later run over by a car on the highway, deepening the peril surrounding the sword.

Soham and Brishti tour Kolkata, with Soham expressing a fascination for Bengal's history. Brishti suggests they pursue a scholarly path by seeking help from her father, Ashutosh Singha. The city's historic aura frames their later discoveries.

Ashutosh is interviewed, and Brishti mentions unnamed chits about conspirators against Siraj ud-Daulah. Soham senses a thread tying the chits to Brishti's father and a hidden gift. Ashutosh agrees to grant the scholarship and asks Soham to stay at his house during the study.

Ashutosh recounts Somnath's death and the clue he sent about a hidden gift. The riddle hints at a house connected to Warren Hastings' case against Maharaja Nandakumar. Soham and Brishti begin pursuing the clues, aided by an old priest.

An additional note explains Dinabandhu Mitra's Neel Darpan and its English translation by Michael Madhusudan Dutt, linking to the arrest of Reverend James Long for publishing the play. The second riddle further narrows the search toward the circle around Nandakumar and his associates.

Abhiraj, Brishti's brother, steals the Singha family deity's nose-ring to satisfy Amirchand's demands for collateral. Amirchand reacts with fury as the theft threatens his leverage. Sakkhi Gopal's hints remind everyone that Somnath's memory is at the center of the case.

The duo reach James Long Sarani where a shop owner buries a ledikeni—the clue ties to Lady Canning's arrival and Somnath's prior knowledge. Soham deduces that burying the sweet points to a grave site in Barrackpore. The trail tightens around a historical connection to the past.

In Barrackpore, the gardener who knew Somnath is shot dead before revealing his link to the mystery. Soham and Brishti escape with another letter that pushes the pursuit forward. The sense of danger escalates as Amirchand's reach widens.

A call leads the pair to a North Kolkata lock-maker and then to Old Mission Church, where Madhusudan Dutt's conversion figure enters the tale. The Father tries to reveal more before being killed, deepening the conspiracy and danger around the gift.

Soham and Brishti retrieve the final chit from the Bagbazar library along with a map. Amirchand and his goons ambush them, killing the librarian and stealing the map, causing the hunt to reach a fever pitch. The treasure's location remains just out of reach.

Sakkhi hints that Somnath was closely connected to Soham and reveals that Soham is Somnath's son. Brishti and others confront Ashutosh about his betrayal and the chits' orchestrated ends. The truth is that the chits were designed to force a confession.

Brishti and Soham hurry to Murshidabad to locate the sword, guided by the final riddle pointing to Khoshbagh and the Katra mosque. Amirchand and his men dig, but Somnath's plan triggers an electric trap that disables them. Jahnabi, revealed as a CID officer, arrives to rescue them.

Ashutosh is arrested for complicity in the conspiracy, and the sword is turned over to the museum for safekeeping. Somnath's manuscript is published by someone else, exposing betrayals tied to the chits. The film ends with Soham processing the revelation of his father.