Racing against time, Shekhar and Jayavrat hunt for clues across Calcutta left by the scientist Gupta, aiming to find a vial with the secret gas formula. As they near the final code, Shekhar faces M in a deadly struggle.

• Arthur Conan Doyle
• Srijit Mukherji
• Aniruddha Guha

• Kundan Roy
• Kavita Vaid
• Kay Kay Menon