Guide to Spies 5.

Spies, our existence is everywhere,

Spies, an ethreal presence meandering through the air.

Spies, always seeing, never seen,
Spies, sense all so sharp, so keen.
We smell your sweat, we see your fear,
We sneak up behind you, and say, "Listen here...

We can see you, but you can't see us.

So just ignore us, no need to fuss..."

We hear your thoughts,
We see your words.
Quiet, and unseen,
We are never heard...

~Highlander
Think you've got what it takes to be a spy? Feh...prove it.