Simpson films this in a very dark and murky style--virtually monochrome with only glimpses of colour and lots of engulfing shadows. He also fills the film with flickering video effects and the jarring angles of both surveillance cameras and Sean's body-cam. This strong style effectively covers over the low budget, giving the film a strongly original visual look. Although it's also somewhat annoying that no one ever turns on a proper light bulb, and the images won't just sit still long enough for us to really see anything. The cast is strong and intriguing; we know immediately that there's more to these people than they're letting on, and it's great fun watching the masks drop. Evans is effective in a rare dramatic role that seems to have been created deep in his gut and emerges through his brutally shaved head. Yet all of the characters are just a bit too overwrought; the film builds to a series of histrionic scenes drenched in tears and blood (among other things). But there's a strange lack of any humour, black or otherwise, that might have actually heightened the suspense. Because as it is, it's so arch and twisty that it starts to feel corny in the end. Yes, it's a fascinating story with clever jabs at CCTV, reality television and criminal profilers, but it's never as scary or emotional as Simpson wants it to be.