Three Welsh families give up their 21st century creature comforts and travel back in time to 1944 to face the hardships of life during the Second World War. With victory nearing, the pressure is on to fuel the frontline in the mining community of the Coal House. Will the men in the mine and the women at the munitions factory hit their deadlines? The scholarship exam looms at school, and a testing day in the mud leads to promotion for one of the Home Guard.