Made in the middle of the Cold War and adapted from a John Le Carre novel, this grittily bleak thriller stars Richard Burton as the British Berlin spy station boss who, apparently burnt out by the demands of his job, is ripe for cultivation by the East German STASI as a potential defector. A harsh corrective to the glamorous world of James Bond, this also stars Claire Bloom as the communist seductress and Oscar Wernar as his nemesis.