The shadow war

As I strolled down the avenue, I realized that my shadow was not my own.
The embassy frequently warned us about rogue shadows, the shadows of their greatest and most successful spies.
“Watch your back!” Say the posters.
This is why all official business happens in specially-built light rooms, with light coming from all directions to purge any rogue shadows.
Trapped in dark prisms and shadow boxes, kept in a massive safe.
Until the enemy offers an exchange.
Their captured shadows for ours.
Lining up on the bridge, facing each other, flashlights and spotlights to ensure they are genuine.