Harry Brown is a 2009 British vigilante action-thriller film directed by Daniel Barber and starring Michael Caine, Emily Mortimer, Jack O'Connell, and Liam Cunningham. The story follows Harry Brown, a widowed Royal Marines veteran who had served in Northern Ireland during The Troubles, living on a London housing estate that is rapidly descending into youth crime. After a violent gang murders his friend, Harry decides to take justice into his own hands.
The film also features actor and rapper Plan B who, with Chase & Status, is also responsible for the film's theme music track "End Credits." Harry Brown premiered on 12 September 2009 as a "Special Presentation" at the 2009 Toronto International Film Festival and was released theatrically in the United Kingdom by Lionsgate UK on 11 November 2009; the film was released in the United States by Samuel Goldwyn Films and Destination Films on 30 April 2010.
(Summary from Wikipedia)