" Espionage has something of the quality of a dream. In the spy's world, as in dreams, the terrain is always uncertain. You put your foot on what looks like solid ground and it gives way under you and you go into a kind of free fall, turning slowly tail over tip and clutching onto things that are themselves falling. This instability, this myriad-ness, that the world takes on, is both the attraction and terror of being a spy. Attraction, because in the midst of such uncertainty you are never required to be yourself; whatever you do, there is another, alternative you standing invisibly to one side, observing, evaluating, remembering…. This is the secret power of the spy… it is the power to be and not be, to detach oneself from oneself, to be oneself and at the same time another. The trouble is, if I were always at least two versions of myself, so all others must be similarly twinned with themselves in this awful, slippery way. "
― John Banville , The Untouchable