I'm just trying this out today with my deck of cards!
I'm stuck in the Great Tower, I've done everything I think I can, including breaking down the door to see the comatose guy, and seeing the Attwater woman's corpse, and opening the treasure chamber in the Main Hall.What do I do now?
Huh. I had a similar idea for a game myself a long time ago. I guess great minds think alike!
Ran it systemless for my friends. Mostly based on the Laundry Files by Charles Stross and Warehouse 13.