Jonny and Bunty mess up a murder and reach Jonny's aunt's place. She tells that Buchku, his cousin brother will be staying with them for higher studies.

Jonny's childhood flame Monalisa comes to Kolkata to shoot for a documentary on Bangla Band. Jonny decides to impress her by creating a fake rock band.

Bunty receives a letter from a friend who asks for a favor: to hide a dead body at their place for a few days. Meanwhile, Buchku is smitten by classmate Bipasha.

As celebrations continue, Buchku, gets kidnapped by Haatkata Haradhan, nemesis of Jonny and Bunty, who asks for a large ransom.

The Ganglords execute their dream project of kidnapping a film star. But things take a different turn as opposed to their own expectations.

Buchku starts getting into the good books of Bipasha, while Bunty is detected with a disease. He wants Jonny to train Buchku in their profession.

As their missions fail every time, Bunty and Jonny request an author to write a biography on their lives, that can help them become successful gangsters.

The author agrees to write only on one condition: she wants to include the names of a few serial killers, starting with her own name. Is she an author for real?

It's Buchku's birthday and everyone is invited to the surprise party. While they are celebrating, they forget to invite the dreaded Haatkaata Haradhan.