A movie which feels like the filmmakers knew what they wanted to achieve, but were unsure on how to go about it.
That rarest of films, one that genuinely keeps you guessing to culminate in some palpable tension come the third act.
Vincenzo Natali's debut holds a beauty in purity that matches the mathematical conundrum its characters find themselves in.
Juxtaposes the supernatural with real-life threat, whilst holding a very strong point in maintenance of mystery.
Will keep you guessing, until all possibilities for explanation are eventually tied together in an excellent balance of subplot.
An unusually restrained Vincent Cassel is a pleasure, but it's a drawn-out story that runs out of steam before a rushed conclusion.