The first few decades of the twentieth century. It was a very turbulent time in Bangladesh. Agni Yuga in Bengal. At that time, the British were in front with the revolutionaries of Bengal. Various adventurous activities of young people who believe in armed freedom war are distracting the British administration, and Calcutta police forces are using all their strength to suppress the revolution. It is another Lalbazar. Unseen Lalbazar. That turbulent time is the source of this book. A book in which veteran IPS officer Supratim Sarkar culled from the documentary evidence of the State and Kolkata police archives is unknown.