Based on actual events that took place on 26 April 1974, former debutante turned IRA member Rose Dugdale and three comrades carried out an armed raid on Russborough House, Wicklow, in which nineteen masterpieces were stolen in an effort to support the IRA’s armed struggle. The film plays out over the course of the days following the raid, when Rose is in hiding in a remote cottage.

After discovering his wife's infidelities, Gerry leaves London to look after his deceased brother's business and family in Singapore. Discovering a foreign world of opportunity that had not existed before gives Gerry a chance at starting over by slipping into his brother's life - both emotionally and physically. However, leaving his wife and child behind in the UK is not so easy as Gerry must choose between becoming his brother's alter ego 'Mister John' or returning to London to face his failing relationship.