‘Angti Rahasya’ (mystery of the ring) is a supernatural thriller. Sourav and Urmila are a couple who come to enjoy their honeymoon in a guest house located far from the madding crowd of the city in a quiet and serene surrounding. Sourav finds a beautiful ring in their room. He gifts the ring to Urmila. Urmila starts experiencing supernatural presence in the guest house. There’s another couple staying at the guest house who also find the place eerie. One day somebody knocks the door of Sourav and Urmila’s room but on opening the door they find no one. The caretaker uncle Dipu says that it must be a mad woman who wanders around the place. Urmila feels that someone is trying to take that ring out from her fingers one night. on another night she feels somebody is dropping sand on her. She also sees blood stains on the stairs. One day Urmila finds blood stains on her cheeks. When Sourav confronts the caretaker he says that the owner of the guest house had killed his girlfriend and buried her beside the lake. It’s her spirit that haunts the place. Sourav decides to inform the police and get the owner punished.