Viswasghatak by Narayan Sanyal [Hardcover]

"Biswasghatak" is a Bengali novel written by Narayan Sanyal, first published in 1969. The title translates to "The Betrayer of Trust," and the book delves into the moral and ethical dilemmas faced by individuals in the backdrop of significant historical events.

The novel is set during World War II and revolves around the controversial figure, a German theoretical physicist and atomic spy who passed critical information to the Soviet Union. 

The story weaves through that scientist's journey from his early days in Germany, his involvement in the Manhattan Project, to his eventual exposure as a spy. Through detailed research and narrative skill, Sanyal paints a vivid picture of the political and social climate of the time, and the inner workings of espionage and scientific communities.

"Biswasghatak" is not just a historical novel but a deep exploration of human conscience, loyalty, and the often blurry line between right and wrong.