Beas Banerjee, an autopsy surgeon, suffers from breast cancer. Meanwhile, Kolkata witnesses a couple of unnatural deaths simultaneously. Are these deaths mere accidents or suicides?

Beas Banerjee is intrigued when a national level swimmer dies of drowning in a local lake. She discusses the case with her friend Barun Sarkar, who is a cop, but he doesn't find anything strange. Is Beas being overly suspicious, or is a heinous foul play indeed at work?

A few years ago, Dr. Soumitra Sengupta had conducted a drug trial, and some of the participants were found dead under mysterious circumstances. Is there any connection between the deaths that occurred then and now?