The Ipcress File (1965) - Michael Caine, Nigel Green, Guy Doleman

In this stylish adaptation of Len Deighton’s thriller, secret agent Harry Palmer finds himself a pawn in a Cold War game. One of a string of moody mid-1960s European spy thrillers, it spawned two direct sequels, Funeral in Berlin (1966) and Billion Dollar Brain (1967).