A really interesting spy drama, set in Turkey during WW2. James Mason takes the lead role and does a wonderful job painting a picture of a murky, amoral but romantic figure trying to win out in a complex and desperate situation. The supporting cast barely get a look in, as he inevitably dominates all of his scenes. The rest is slowly-paced and mildly complicated, playing out as a chess game between the allied and axis powers, hugely realistic - it's a true story after all - and after a time, quite compelling.