'Kanchanjungha Express' is the story of Nandini's life. Inspector Surya Sekhar Gupta meets Ranjana in the train Kanchanjungha Express. Ranjana shares the story of her friend Nandini whose two husbands Bhaskar Majumdar and Raj Burman and live-in partner Vikram Sinha died under suspicious circumstances. Surya understands that Ranjana is actually Nandini, the suspect behind the three murders he was searching. He confronts her but Nandini's mentally ill sister Raka confesses to have killed the three men who were torturing her sister. Raka is sent to mental hospital for treatment but doctors are sure she isn't behind the murders."