‘Teesta Parer Kainya’ is the love story of Udasu and Kusum. Kusum is an orphan who gets love and a family after marrying Udasu. But Nurul Miaan and his friend Madhav ruin their lives. Nurul and Madhav always had an eye on beautiful Kusum but she rejected their advances. During an ugly spat Udasu stabs a fellow villager. He runs away and goes into hiding to escape from the police. Nurul finds out where he is and gets him murdered. Kusum keeps wandering madly after Udasu’s death. The panchayat helps the police to arrest Madhav for molesting a woman. Kusum kills Nurul to avenge her husband’s death and then commits suicide. Kusum and Udasu’s spirit are still found wandering in the Teesta valley.