Darkness at Noon by Arthur Koestler is a powerful and thought-provoking novel, first published in 1940. Set during the Stalinist purges in the Soviet Union, it follows the story of Rubashov, an old Bolshevik revolutionary who becomes a victim of the very regime he helped to create. The novel explores themes of totalitarianism, the nature of power, and the conflict between individual morality and collective ideology. Through Rubashov's imprisonment, interrogation, and ultimate fate, Koestler examines the psychological and ethical dilemmas faced by those living under oppressive regimes. *Darkness at Noon* is a profound critique of the brutality of totalitarianism and the ways in which ideology can corrupt human values. The novel remains a classic, widely regarded as one of the most important political novels of the 20th century.