Mankind is the ultimate enemy and the ultimate cosmic force. For better or worse. Unknown Armies is a game of weirdness, conspiracies, occultism and horror. The tagline is "a game of power and consequences. However, in terms of theme it's more the flip side of the same coin: while Cthulhu is a game about being a fleeting speck of dust in the uncaring cosmic void, UA is anthropocentric horror.
That is, everything revolves around mankind and all the horror's you face either are, were or were created by a human being. I get the idea behind it but it's sure predictable at this point. Anyway, UA's intro fiction is "Legacy" and it at least does a very good job of introducing the feel and concepts behind a UA game.
In fact, personally I use a modified version of Legacy's concept as the intro adventure for pretty much every single supernatural conspiracy game I've ever run. So that should tell you something. Legacy is told from the point of view of Renata Mers Dakota, a girl with a strange name, a shitty childhood and suddenly missing parents.
She just came home from school one day and they were gone: cleared out their things, closed their bank accounts, rented a truck and just fucking left. Not willing to let a shitty childhood get even shittier Renata decides to try and track them down and takes a train to Atlanta after convincing the rental truck company to tell her where it was going.
On the train she's sitting across from Eugene Larue, a hobo with crazy eyes who keeps trying to strike up small talk with her. After arriving she manages to blackmail via breaking and entering and self-made nude pictures an unemployment agency employee into giving up her parent's current whereabouts don't worry, he was an asshole but when she arrives at the address she sees none other than Eugene Larue snoozing in a truck outside.
