Greg Davies's father made sure that his son was born on Welsh soil so that when Greg became a rugby international, he would play for Wales. Fortunately for comedy, Greg showed little talent for rugby, but he retains a sense of connection to his Welsh roots and, two years after his dad's death, wants to know more about them. Greg gets more than he bargained for when he identifies a wayward great-grandfather but is rewarded when the trail leads further back to the deepest Welsh roots anyone could wish for.