A bombastic Welsh publican bets a rival that a converted wooden pub barrel can successfully cross the Irish Sea. The pride of the local village is soon put on the line.
The landlord's son is tasked with skippering the Green Beagle barrel boat on a risky journey to the Emerald Isle. Behind closed doors, he tells his son not to worry because he will arrange to fake the crossing.
But when the big day finally arrives, it becomes clear there will be no escaping making this voyage for real.