A young boy's innocent observations leads the local priest to believe he has borne witness to a manifestation of the Virgin Mary. Set in an idyllic rural Northern Ireland in the 1950's.

In 1860, Inspector Jack Whicher of Scotland Yard is sent to rural Wiltshire to investigate the murder of the three-year-old boy Saville Kent, who was snatched from his bed at night and murdered.

A married couple move back to his childhood village to start a family but a surprise visit from the husband's brother ignites sibling rivalry and exposes the lies embedded in the couple's relationship.

With access to the real players, and using extensive, dramatic reconstruction Supergrass illuminates twelve crime ridden years in a world that seems far off Britain now, but is actually near-history. A world where the policing rules were very different, it explores the strangely ordered rules of the underworld where Supergrasses were the only way to crack the gangs, who were causing havoc in seventies ‘Sweeney’ London. A London where guns were used in armed robberies every week, and the city felt like the Wild West. The film tells the stories of dramatic crimes and outrageous criminal characters. People like London’s biggest bank robber and the first supergrass in 1972, Bertie Smalls, and Maurice O Mahoney, armed robber and hard man who shopped hundreds of associates in 1976.

As a country arms itself for war, a family tears itself apart. Forced to avenge his father's death but paralyzed by the task ahead, Hamlet rages against the impossibility of his predicament, threatening both his sanity and the security of the state.