It's cop-killer versus killer-cop.
Blitz (2011) is a British crime movie set in South East London.
Synopsis: Detective Sergeant Tom Brant (Jason Statham) is a quick-tempered police officer from the South East London police station who uses his own way to deal with criminals, causing him to get into trouble with his superiors.
When a serial cop killer known as "The Blitz" / Barry Weiss (Aidan Gillen) carries out his cop-killing spree, Brant begins to work with Sergeant Porter Nash (Paddy Considine) who has just been transferred from West London branch.
Just when Brant and Nash think they have The Blitz under control, he outsmarts them again and again. Facing the question: "If we can't protect our own, then what good are we?" they have to act radical to pin down The Blitz once and for all.
It's Jason Statham again and his favorite genre: crime thriller. So I'd say it's nothing new in watching Statham in this movie. Perhaps if he continues playing similar roles, he'd be stereotyped in "good-guy-goes-rogue" or "bad-guy-turns-over-a-new-leaf" kind of roles.
In terms of performance, kudos to Aidan Gillen who plays the whistling cop-killer "The Blitz". His unassuming looks and the way he goes bare-chested and only in his hooded jacket when he shoots cops at point-blank is kinda unnerving.
The twist at the end is a good one, sort of like - sometimes, justification needs to be done outside the jurisdiction of the law. Good one indeed. Even better if this can happen in real life.
So, if cop-versus-criminals crime thrillers are one of your favorite genres, you'd like to add this movie to your collection.