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.
| Actor | Role |
|---|---|
 Dhritiman ChatterjeeByomkesh Bakshi | Byomkesh Bakshi |
 Pradip MukherjeeAjit Bandyopadhyay | Ajit Bandyopadhyay |
 Konkona Sen SharmaDeepa Bhatta | Deepa Bhatta |
| SSonali Gupta BasuSatyabati | Satyabati |
 Indraneil SenguptaDebasish Bhatta | Debasish Bhatta |
 Kaushik SenPrabal Gupta | Prabal Gupta |
 Debdut GhoshSujan Mitra | Sujan Mitra |
 Biswajit ChakrabortyNripati Laha | Nripati Laha |
 Kanchana MoitraSubhra Ghosh | Subhra Ghosh |
 Dwijen BanerjeeBijoy Madhab Mukherjee | Bijoy Madhab Mukherjee |
| NNilendra DewanKharag Bahadur | Kharag Bahadur |
 Subrata Guha RoyKapil Bose | Kapil Bose |