Detective Charulata Mitra is used to investigate mundane cases until she gets her big break, the curious case of Mrs. Sen.

Charu suspects foul play in the death of Mrs. Sen, as the investigation reveals a dark secret of the Sen family.

Charu links the murder to a chain of other unrelated killings in the city. Police now collaborate with Charu to apprehend this killer. Charu faces a different threat.

Charu's investigation, lead the team to Katwa in search of the elusive killer, who has been dead for more than 25 years.

Charu lays out a trap to apprehend the killer but not everything goes as planned!