I had originally planned to use Pict Song, by Rudyard Kipling, for the current ghostbusting SteamCraft game (that seems to have not ended on schedule...) but I think that it may work better for an espionage oriented one instead -
Rome never looks where she treads.
Always her heavy hooves fall
On our stomachs, our hearts or our heads;
And Rome never heeds when we bawl.
Her sentries pass on--that is all,
And we gather behind them in hordes,
And plot to reconquer the Wall,
With only our tongues for our swords.
We are the Little Folk--we!
Too little to love or to hate.
Leave us alone and you'll see
How we can drag down the State!
We are the worm in the wood!
We are the rot at the root!
We are the taint in the blood!
We are the thorn in the foot!
Mistletoe killing an oak--
Rats gnawing cables in two--
Moths making holes in a cloak--
How they must love what they do!
Yes--and we Little Folk too,
We are busy as they--
Working our works out of view--
Watch, and you'll see it some day!
No indeed! We are not strong,
But we know Peoples that are.
Yes, and we'll guide them along
To smash and destroy you in War!
We shall be slaves just the same?
Yes, we have always been slaves,
But you--you will die of the shame,
And then we shall dance on your graves!
We are the Little Folk, we, etc.
Put this in the mouths of some Welsh anarchists, and see what you get... And who are the Peoples they are speaking of? Given that Victorian England often compared itself to Rome you can see where this one is headed.
Completely separate, but also nifty - Wowio now has Gray's Anatomy available for download. If you are looking for printed props that might be sitting around a necromancer or reanimator's lab the illustrations, and even some of the text - redone in different fonts, can make a gruesome discovery or two.

I now have an image in my head of an anatomical/medical school with animated cadavers for dissection....
The Auld Grump