Based on the 2009 investigative book by BBC correspondent Martin Sixsmith, The Lost Child of Philomena Lee, Philomena focuses on the efforts of Philomena Lee (Dench), mother to a boy conceived out of wedlock — something her Irish-Catholic community didn’t have the highest opinion of — and given away for adoption in the United States. In following church doctrine, she was forced to sign a contract that wouldn’t allow for any sort of inquiry into the son’s whereabouts. After starting a family years later in England and, for the most part, moving on with her life, Lee meets Sixsmith (Coogan), a BBC reporter with whom she decides to discover her long-lost son.