The Deadly Affair (1967)

Synopsis
John LeCarre's Call for the Dead was the basis for this gloomy, complex spy story. James Mason plays a British secret agent puzzled by the sudden suicide of Foreign Office higher-up Robert Flemyng. Mason had worked on Flemyng's security clearance himself, and can't fathom what personality quirk he might have missed. The agent suspects that the dead man's wife (Simone Signoret), a concentration camp survivor, may hold the answer to Flemyng's despair, but the Foreign Office wants Mason to drop the case. Mason hires retiring Inspector Harry Andrews to do some private detective work. What Mason and Andrews find out is more insidious than they've imagined; worse, Mason is saddled with a new dilemma--his wife (Harriet Andersson) has been unfaithful with a colleague (Maximillian Schell). The Deadly Affair is not for the spell-things-out James Bond crowd, but those willing to stick with it will find the experience rewarding, if ultimately depressing. ~ Hal Erickson, All Movie Guide