A Dandy in Aspic

A Dandy in Aspic is a 1968 Technicolor and Panavision British spy film, directed by Anthony Mann, based on the novel of the same name by Derek Marlowe and starring Laurence Harvey, Tom Courtenay and Mia Farrow. It was Manns final film.

Eberlins Laurence Harvey superiors in Britain instruct him to find and assassinate a KGB agent named Krasnevin, believed to have killed a number of British agents. This presents a problem for Eberlin, as he is Krasnevin. Summoned to a meeting at a country house, he is presented with a photograph of the suspected Krasnevin. It turns out to be his handler and gobetween with Moscow.He is partnered with a ruthless, cynical and sociopathic British agent Gatiss Tom Courtenay, who openly distrusts and dislikes him. Mia Farrow plays a Londonbased photographer with whom Eberlin has an affair. Much of the film takes place in West Berlin, where Eberlin tackles the dilemma posed by his mission by attempting to escape across the Berlin Wall to the East. His attempts are frustrated by his partnership with Gatiss, and by the Soviet authorities, who are keen to retain one of their top agents in British intelligence. ........

Source: Wikipedia