"The Deadly Affair" is a 1966 British film directed by Sidney Lumet, based on the novel "Call for the Dead" by John le Carré. The story follows George Smiley, a British intelligence officer, who investigates the mysterious death of a colleague. As he delves deeper, he uncovers a web of espionage, betrayal, and personal conflict. The film stars James Mason as Smiley and features Simone Signoret and Maximilian Schell in key roles. It explores themes of loyalty and the moral complexities of intelligence work during the Cold War, highlighting the emotional toll on those involved in espionage.