Pradip Gurung is a fearless young man. He needs 4 lakhs rupees to save an orphanage. He makes a deal with an industrialist Ramsundar Chhetri and goes to a risky mission to collect rare pictures of the meeting of Kalo Cheetah (black leopard) in Darjeeling-Gangtok border area. Pradip meets Sujata, a young lady who leaves her house after falling out with her elder sister. The duos go for the adventure and subsequently involve with a series of mysterious incidents.

Subarna Sen, an Oxford University professor, travels to India after the death of his maternal uncle. He learns that his uncle's palace has a hidden treasure and decides to find it.

Convinced that his life is in jeopardy, Satyakam, the son of a business magnate hailing from Mussoorie, approaches Byomkesh with a plea for help. The legendary detective soon heads to Mussoorie, where he finds out that the youngsters worst fears have come true. Can Byomkesh unravel the mystery shrouding Satyakam's murder before it is too late?

The lives of a few individuals who frequently visit the famous Park Street in Kolkata get intertwined in an intricate way.

Madly Bangalee is a Bengali rock band that inspires the film’s title. They rehearse in a dowdy garage of Kolkata, owned by Bobby (Lew Hilt), who owns Bobby’s Garage. Four young boys with stardust in their eyes practise their numbers not knowing what they are really aiming at. But the garage is under threat from a South Kolkata don Baburam (Chandan Sen). One morning, an elderly man, San (Anjan Dutt), arrives from "America and Paris." Baaji, (Sumit) the drummer who is a Muslim had to drop out of school. He escapes from the trap of turning a terrorist like his older brother Sultan. He later becomes a police officer who bashes up everyone who tries to bribe him. Neon (Tanaji) plays the rhythm guitar but, sucked into the world of drugs, he disappears from the face of the earth with his guitar. Pablo, lead singer, bass guitarist and lyricist, leaves for the US and the group breaks up. Bobby dies.