Greg Davies's father made sure that his son was born on Welsh soil so that when Greg became a rugby international, he'd 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-est roots that anyone could wish for.