Chupi Chupi Ase is a murder mystery. An elderly lady is killed on a rainy night. The clues lead to a hotel run by Ms. Kanika and Mr. Prabir. They've Dr. Bajpai, Ms. Dhar, Mr. Beni, Mr. Biraswamy and Mr. Madhusudan as the boarders. Inspector Ghosal comes to investigate the case. He tells that the case is related to Chapa Khola orphanage where three siblings were tortured. No one accepts any links with the orphanage. Ms. Dhar is murdered. The consequent events finally lead to the real murderer.