The Cabal is a piece of satirical adventure about infighting within the interactive fiction community (I think). It blends more "traditional" conspiracy theory tropes with references to the history of text adventures and the culture surrounding them. I didn't understand many of the references to the politics of the IF newsgroups (not my time and place), but the game was entertaining nonetheless.
The Cabal is pretty short, and the few puzzles are mostly painless. One puzzle is taken directly from the old Infocom game Infidel, so I had to consult a walkthrough of that game, which itself amused me.
Even though I found The Cabal amusing, I can't say I'd necessarily recommend it, as the in-jokes are pretty arcane.