"Extraction" is a big, mostly dumb and very violent action flic that has the common sense not to try to be anything else and is actually a surprisingly good example of its kind, providing, of course, that this is the kind of thing you like. The plot is simple; the action relentless. A Mumbai drug-lord's son is kidnapped and it's up to mercenary Chris Hemsworth to get him back. Neither he nor the film hang around. As I've said, it's both violent and relentless; a non-stop catalogue of killings and mutilations, choreographed to bloody perfection by first-time director Sam Hargrave. Of course, there isn't a frame that's actually believable. This is a live-action video game, based on a graphic novel, brilliantly photographed by Newton Thomas Sigel in and around Dhaka and with enough good guys and bad guys killing each other relentlessly to keep it on the boil for two hours. Brains may be largely in short supply but there's certainly no shortage of brawn.