The Great Ecstasy of Robert Carmichael (2005)

An introverted, socially awkward, middle-class youth, Robert Carmichael, is a talented cello player but is bored by his existence in the coastal town of Newhaven. He becomes associated with several other unsavory teenagers and is soon tempted into the use of hard drugs like cocaine and ecstasy. Robert initially does not take part in the rape of a teenage girl in a squalid flat with the gang, but later joins in another violent attack on a middle-aged couple, with the woman involved being viciously raped.