Liam O'Leary (Brendan Gleeson), an Irish property developer of humble origins, has made it big and fast on the back of the Celtic Tiger. His hubris has led him into a scheme to build a national stadium but a rival developer has connived to thwart his plans. Wildly over-extended, Liam finds himself struggling in a receding market. Stressed and over-stretched, he seems on the verge of a mental breakdown when, to his horror, he sees his Double.

Is this a harbinger of his death? His neglected wife, Jane (Kim Cattrall) is distressed by his erratic behaviour and treats his claim to have seen his Double as a hallucination. he confronts his Double and discovers a shocking truth that makes him ask the question—who am I?