Three loser army reservists expecting a weekend of boozing and goofing off around their barracks are suddenly press ganged into service by a brutal sergeant (the pistache of a million nasty comedy army sergeants) to fly to Iraq.

When a mutilated and murdered woman turns up on the bank in an apparently unrelated crime, Denzel smells the rat. He’s approached by the FBI to take part in a top secret surveillance program where they can look at any point in the city exactly four days before in an unceasing datastream.

It’s too full of the sort of tiny detail that can only come out when you have a long relationship with a film, watching it over and over. If you’re the sort of film fan who just wants a hit of entertainment, it’s as boring as Mel Gibson’s dog’s arse.