Mark Renton (Ewan McGregor), a young man with few prospects and fewer ambitions, lives in economically depressed Edinburgh. Like most of his friends, Renton is a heroin addict who loves the drug's blissful nothingness; financing his habit also provides excitement and challenges that his life otherwise lacks. Renton's two best friends are also junkies: Sick Boy (Jonny Lee Miller), a snappy dresser obsessed with James Bond, and Spud (Ewan Bremner), a guileless nerd who suggests Pee Wee Herman's debauched cousin. Renton and his pals also hang out with Begbie (Robert Carlyle), a borderline psychotic who loathes junkies even though he drinks like a fish. After one too many brushes with the law, Renton kicks heroin and moves to London, where he finds a job, a flat, and something close to peace of mind. However, Sick Boy, Begbie, and Spud all arrive at his doorstep on the trail of a big score, leading Renton back into drugs and crime.
by Mark Deming synopsis