A woman is roaming through an old asylum... oh hell, did her blood just wake up the evil that lives in the asylum? Yeah, that’s not cliche. But here we go - blood goes into the drain and a dark shadow spreads across the wall. This surely won’t go well for the film crew making a movie there.
Chris arrives at the asylum to watch the filming of a low budget movie he's written. No one seems to want him there. There’s no reason provided for his visit, and since he doesn’t do anything except get in everyones way, and the crew seems irritated by his presence, let's just assume he's there for plot convenience.
Cast members start to be affected by the evil, and start acting strangely. Chris sees some strange things, but hey they're making a horror film, so it's not that far off base when weird things happen. But soon it becomes apparent that something is horribly wrong since people are dying. Meh.