Triple Cross (1966)

Loosely based on a true story, Christopher Plummer plays British bank robber Eddie Chapman who finds himself caught between the waring parties in WW2, the British and the Germans. Working as a spy for both sides he tries to play the 3rd reich and the British against each other. The real life Chapman described himself as a completely 'amoral' person, which adds a nice philosophical touch to this colourful spy-flic.