Jennifer Corner is a rather scatterbrained middle-class housewife. Her husband Henry is a school art teacher, and they have three children, Henry, Robin and Trudi.

The young inventors Dick and Jenny Brewster, build their own 'Hoverbug' and hope to win the race which has been organised for home-made Hovercraft, but their arch rivals, Charlie and Sydney, bend the rules by enlisting professional help and by employing devious means to sabotage the Hoverbug.