This is the Levi Strauss theme. We have used this for the idea of the two characters being corresponding. For our story it would be that the detective is the hero and is light where as the killer is the villain and has a dark atmosphere around him.
This final theme is called Barthes action and enigma code. We have chosen this for the idea of the enigma scenario and the 'Who done it' scene in our OTS task. The enigma is also helpful to link the terrorist with the detective e.g does he know him.