Alinagarer Golokdhadha is an adventure mystery film, released on 20 April 2018, directed by Sayanton Ghosal, produced by Rutrum Juin, starring Anirban Bhattacharya and Parno Mittra in lead roles. It is film collaboration for a Bengali movie between Eros International and Champion Movies.

A group of scientists set off on a quest to find Red Mercury, a mythical chemical compound, that can help solve the world’s fossil fuel crisis and save the life of a little alien.

Anna, an Italian woman, approaches Shankar, an explorer, to accompany her in search of the golden city of El Dorado. He accepts the offer and sets out on an adventure through the Amazon.

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?