Banshees of Inisherin is set on the fictional island of Inisherin in 1923 during the Irish Civil War. Pádraic (Colin Farrell) is an extremely kind man whose entire being is shaken after experiencing the abrupt and casual cruelty of Colm (Breendan Gleeson), two lifelong friends whose friendship is shattered after conflict erupts in the country. Pádraic, confused and devastated, tries to rekindle the relationship with the support of his sister Siobhan (Kerry Condon), who, along with Dominic (Barry Keoghan), son of the local policeman, has his concerns within the small island. But when Colm issues a shocking ultimatum to make his intentions come true, events begin to escalate.