So I'm getting a few players together and hopefully running a few games of wfrp with a distinctly evil tone.
The party are all members of a secret society called the Esoteric Society of Wellwishers that DEFINITELY ISN'T A CHAOS CULT.
They occasionally get requested to perform tasks for the society and attend meetings. Using the secret society sheets, they can rise or fall in the ranks of the society as they complete or fail miserabely to complete, these tasks.
An interesting mechanic I was thinking of putting in was a Cover Story Tracker.
At the outset of each adventure, the group comes up with a story based on what their goal is and what they plan to tell people asking them what exactly they are doing. As the cover story gets eroded by bad roleplaying, breaking their story or fibbing, so the party tension will raise and they get closer to being unmasked. There is also a "Heat" event on the tracker, depending on how risky their story is, the event will occur sooner or later, when the cover story tracker decends below the "Heat" tracker, the heat is on! Various parties are now asking why the group is sticking their nose in other people's business and people are looking into their background. They take misfortune or challange dice to investigation attempts AND there is now a powerful, independant investigator on thier tale, possibly wearing a tall, wide brimmed hat...