Four aging friends from working-class Edinburgh reunite after years apart and find their lives have taken bitterly different turns: a one-time heroin addict back from exile, a scheming bar owner, a struggling alcoholic, and a dangerously violent ex-con. Their attempt to recapture youth and settle old scores spirals into darkly comic misadventures, criminal schemes and brutal confrontations across Scotland and abroad, forcing them to face addiction, betrayal, mortality and the consequences of their past choices.