“Giles Alderson as the possessed David really hollows his character out and crawls inside. David is far more frightening than any of the monsters that his psyche could ever produce, and Alderson does a balls-out, bang-up job of bringing that character to life. He’s a sniveling wreck and a truly frightening psychotic. David’s descent isn’t so much a decline as it is a revelation of just how disturbed he’s always been, and how scary-good he is at hiding it when need be. He really is the sort of guy you wouldn’t think twice about allowing in to crash on your sofa. And that’s precisely what makes this true horror.”