well and magic work in mysterious way . this movie about 4 prisoner and try to escape with the help of spell and write by another prisoner century ago be a superb occult thriller with a surprising end and lot of suspense . even if it have something of a theater play ( almost everything happens in the cell ) it never get boring and it be act very well . in the tradition of cube you felt trap with the character and even if they be criminal and you develop some sympathy with some of them and only to change your mind by the twist the story take . some happening catch you off guard and there be always a touch of insanity in the air . altogether intense and entertaining and a i do not expect anything ( a friend rent it ) and it be a positive surprise .