Set against the backdrop of the political divisions dividing Northern Ireland, this comedy drama centers on a greyhound cared for by a young boy, Donal. Working in the kennel of greyhound trainer, Good Joe, Donal is promised part ownership of The Mighty Celt if Donal can help inspire the dog to win three races in a row. As his life appears to be improving with the form of The Mighty Celt, Donal is shocked when an old flame of his mother returns and changes their lives.