Joe (David Thewlis) envies identical twin brother, Harry. His sibling has the freedom of a comfortable bachelor lifestyle, funded by a generous army pension whereas Joe is in a dead end job – no money, squabbling children, a live in mother and a wife that he thinks has fallen out of love with him. As the brothers watch a football match on the television one evening, Harry chokes on a sweet and loses consciousness. Whilst Joe waits for the ambulance to arrive, he realises that the chance of a lifetime is staring him in the face. Joe swaps clothes and takes on his brother's identity. The assumed body of Joe is pronounced dead at the hospital whilst the real Joe is left comforting his wife, Mary (Bronagh Gallagher). Can Joe keep up the pretence that he is her brother-in-law?