A decent script, a competent cast and crew and, most importantly, the will, time, money and passion to do it all. It's a wonderfully frustrating, rewardingly claustrophobic and tensely insular experience that sticks you right in the slightly off-kilter head of its protagonist and does a great job of making you feel exactly the way she does at every moment. The pace is almost perfect, as we're dealt a number of blows every time we begin to get comfortable in each new situation, and the slow descent from slightly strange to straight-up sinister is a palpable and uncomfortable one, though it isn't pushed quite as far as it perhaps could have been, and it keeps you unsure about everything you see. The nods back to classic seventies horror, It will keep you constantly on the edge of the seat throughout this gripping, agitating, intriguing and generally very entertaining thriller.
