Deepa and Debasish are married under unhappy circumstances, and their relationship proceeds as such, with little communication or connection between husband and wife. Meanwhile, there is a series of mysterious murders where the quill of a porcupine pierces the heart of the victim, killing them instantly. These two stories converge, requiring the presence of detective Byomkesh Bakshi to solve the mystery.

A scientist accidentally finds a drug that can reveal an individual's past. However, when a few politicians fear their exposure, they plot to kill him.

Shaon and Antor are a young couple facing the pressures of living up to the expectations of parents and society.